diff --git a/src/grt/src/MakeWireParasitics.cpp b/src/grt/src/MakeWireParasitics.cpp
index 58143e5f409..75cef60e498 100644
--- a/src/grt/src/MakeWireParasitics.cpp
+++ b/src/grt/src/MakeWireParasitics.cpp
@@ -184,17 +184,13 @@ void MakeWireParasitics::makeRouteParasitics(
     NodeRoutePtMap& node_map)
 {
   const int min_routing_layer = grouter_->getMinRoutingLayer();
-  const bool is_congested = grouter_->isCongested();
 
   size_t resistor_id_ = 1;
   for (GSegment& segment : route) {
     const int wire_length_dbu = segment.length();
 
     const int init_layer = segment.init_layer;
-    // allow segments out of the layer range only when the design have
-    // congestion, becaus GRT may produce segments out of the layer range in
-    // this scenario.
-    bool is_valid_layer = init_layer >= min_routing_layer || is_congested;
+    bool is_valid_layer = init_layer >= min_routing_layer;
     sta::ParasiticNode* n1 = is_valid_layer
                                  ? ensureParasiticNode(segment.init_x,
                                                        segment.init_y,
@@ -205,7 +201,7 @@ void MakeWireParasitics::makeRouteParasitics(
                                  : nullptr;
 
     const int final_layer = segment.final_layer;
-    is_valid_layer = final_layer >= min_routing_layer || is_congested;
+    is_valid_layer = final_layer >= min_routing_layer;
     sta::ParasiticNode* n2 = is_valid_layer
                                  ? ensureParasiticNode(segment.final_x,
                                                        segment.final_y,
diff --git a/src/grt/src/fastroute/src/utility.cpp b/src/grt/src/fastroute/src/utility.cpp
index d0a86c52d34..eff58691008 100644
--- a/src/grt/src/fastroute/src/utility.cpp
+++ b/src/grt/src/fastroute/src/utility.cpp
@@ -494,10 +494,10 @@ void FastRouteCore::assignEdge(int netID, int edgeID, bool processDIR)
         }
       }
 
-      if (best_cost
-          <= 0) {  // assigning the edge to the layer range would cause overflow
-        // try to assign the edge to the closest layer below the min routing
-        // layer
+      // assigning the edge to the layer range would cause overflow try to
+      // assign the edge to the closest layer below the min routing layer.
+      // if design has 2D overflow, accept the congestion in layer assignment
+      if (best_cost <= 0 && !has_2D_overflow_) {
         int min_layer = net->getMinLayer();
         for (l = net->getMinLayer() - 1; l >= 0; l--) {
           fixEdgeAssignment(min_layer,
@@ -549,10 +549,10 @@ void FastRouteCore::assignEdge(int netID, int edgeID, bool processDIR)
         }
       }
 
-      if (best_cost
-          <= 0) {  // assigning the edge to the layer range would cause overflow
-        // try to assign the edge to the closest layer below the min routing
-        // layer
+      // assigning the edge to the layer range would cause overflow try to
+      // assign the edge to the closest layer below the min routing layer.
+      // if design has 2D overflow, accept the congestion in layer assignment
+      if (best_cost <= 0 && !has_2D_overflow_) {
         int min_layer = net->getMinLayer();
         for (l = net->getMinLayer() - 1; l >= 0; l--) {
           fixEdgeAssignment(min_layer,
@@ -621,7 +621,8 @@ void FastRouteCore::assignEdge(int netID, int edgeID, bool processDIR)
       for (l = 0; l < num_layers_; l++) {
         if (layer_grid[l][k] > 0) {
           gridD[l][k + 1] = gridD[l][k] + 1;
-        } else if (layer_grid[l][k] == std::numeric_limits<int>::min()) {
+        } else if (layer_grid[l][k] == std::numeric_limits<int>::min()
+                   || l < net->getMinLayer() || l > net->getMaxLayer()) {
           // when the layer orientation doesn't match the edge orientation,
           // set a larger weight to avoid assigning to this layer when the
           // routing has 3D overflow
@@ -736,7 +737,8 @@ void FastRouteCore::assignEdge(int netID, int edgeID, bool processDIR)
       for (l = 0; l < num_layers_; l++) {
         if (layer_grid[l][k - 1] > 0) {
           gridD[l][k - 1] = gridD[l][k] + 1;
-        } else if (layer_grid[l][k] == std::numeric_limits<int>::min()) {
+        } else if (layer_grid[l][k] == std::numeric_limits<int>::min()
+                   || l < net->getMinLayer() || l > net->getMaxLayer()) {
           // when the layer orientation doesn't match the edge orientation,
           // set a larger weight to avoid assigning to this layer when the
           // routing has 3D overflow
@@ -962,9 +964,8 @@ void FastRouteCore::layerAssignmentV4()
         }
 
         treenodes[n2a].assigned = true;
-
-      }  // edge len > 0
-    }    // eunmerating edges
+      }
+    }
   }
 }
 
@@ -2139,8 +2140,7 @@ int FastRouteCore::edgeShift(Tree& t, int net)
             // add the cost of all edges adjacent to the two steiner nodes
             for (l = 0; l < nbrCnt[n1]; l++) {
               n3 = nbr[n1][l];
-              if (n3 != n2)  // exclude current edge n1-n2
-              {
+              if (n3 != n2) {  // exclude current edge n1-n2
                 cost1 = cost2 = 0;
                 if (t.branch[n1].x < t.branch[n3].x) {
                   smallX = t.branch[n1].x;
@@ -2165,12 +2165,11 @@ int FastRouteCore::edgeShift(Tree& t, int net)
                   cost2 += v_edges_[m][smallX].est_usage;
                 }
                 costH[j] += std::min(cost1, cost2);
-              }  // if(n3!=n2)
-            }    // loop l
+              }
+            }
             for (l = 0; l < nbrCnt[n2]; l++) {
               n3 = nbr[n2][l];
-              if (n3 != n1)  // exclude current edge n1-n2
-              {
+              if (n3 != n1) {  // exclude current edge n1-n2
                 cost1 = cost2 = 0;
                 if (t.branch[n2].x < t.branch[n3].x) {
                   smallX = t.branch[n2].x;
@@ -2195,9 +2194,9 @@ int FastRouteCore::edgeShift(Tree& t, int net)
                   cost2 += v_edges_[m][smallX].est_usage;
                 }
                 costH[j] += std::min(cost1, cost2);
-              }  // if(n3!=n1)
-            }    // loop l
-          }      // loop j
+              }
+            }
+          }
           bestCost = BIG_INT;
           Pos = t.branch[n1].y;
           for (j = minY; j <= maxY; j++) {
@@ -2206,8 +2205,7 @@ int FastRouteCore::edgeShift(Tree& t, int net)
               Pos = j;
             }
           }
-          if (Pos != t.branch[n1].y)  // find a better position than current
-          {
+          if (Pos != t.branch[n1].y) {  // find a better position than current
             benefit = costH[t.branch[n1].y] - bestCost;
             if (benefit > bestBenefit) {
               bestBenefit = benefit;
@@ -2217,8 +2215,7 @@ int FastRouteCore::edgeShift(Tree& t, int net)
           }
         }
 
-      } else  // a vertical edge
-      {
+      } else {  // a vertical edge
         // find the shifting range for the edge (minX~maxX)
         maxX1 = minX1 = t.branch[n1].x;
         for (j = 0; j < 3; j++) {
@@ -2240,8 +2237,7 @@ int FastRouteCore::edgeShift(Tree& t, int net)
         maxX = std::min(maxX1, maxX2);
 
         // find the best position (least total usage) to shift
-        if (minX < maxX)  // more than 1 possible positions
-        {
+        if (minX < maxX) {  // more than 1 possible positions
           for (j = minX; j <= maxX; j++) {
             costV[j] = 0;
             for (k = t.branch[n1].y; k < t.branch[n2].y; k++) {
@@ -2276,12 +2272,11 @@ int FastRouteCore::edgeShift(Tree& t, int net)
                   cost2 += v_edges_[m][smallX].est_usage;
                 }
                 costV[j] += std::min(cost1, cost2);
-              }  // if(n3!=n2)
-            }    // loop l
+              }
+            }
             for (l = 0; l < nbrCnt[n2]; l++) {
               n3 = nbr[n2][l];
-              if (n3 != n1)  // exclude current edge n1-n2
-              {
+              if (n3 != n1) {  // exclude current edge n1-n2
                 cost1 = cost2 = 0;
                 if (j < t.branch[n3].x) {
                   smallX = j;
@@ -2306,9 +2301,9 @@ int FastRouteCore::edgeShift(Tree& t, int net)
                   cost2 += v_edges_[m][smallX].est_usage;
                 }
                 costV[j] += std::min(cost1, cost2);
-              }  // if(n3!=n1)
-            }    // loop l
-          }      // loop j
+              }
+            }
+          }
           bestCost = BIG_INT;
           Pos = t.branch[n1].x;
           for (j = minX; j <= maxX; j++) {
@@ -2317,8 +2312,7 @@ int FastRouteCore::edgeShift(Tree& t, int net)
               Pos = j;
             }
           }
-          if (Pos != t.branch[n1].x)  // find a better position than current
-          {
+          if (Pos != t.branch[n1].x) {  // find a better position than current
             benefit = costV[t.branch[n1].x] - bestCost;
             if (benefit > bestBenefit) {
               bestBenefit = benefit;
@@ -2327,27 +2321,23 @@ int FastRouteCore::edgeShift(Tree& t, int net)
             }
           }
         }
-
-      }  // else (a vertical edge)
-
-    }  // loop i
+      }
+    }
 
     if (bestBenefit > 0) {
       n1 = pairN1[bestPair];
       n2 = pairN2[bestPair];
 
-      if (t.branch[n1].y == t.branch[n2].y)  // horizontal edge
-      {
+      if (t.branch[n1].y == t.branch[n2].y) {  // horizontal edge
         t.branch[n1].y = bestPos;
         t.branch[n2].y = bestPos;
-      }  // vertical edge
-      else {
+      } else {  // vertical edge
         t.branch[n1].x = bestPos;
         t.branch[n2].x = bestPos;
       }
       numShift++;
     }
-  }  // while(bestBenefit>0)
+  }
 
   return (numShift);
 }
@@ -2453,13 +2443,12 @@ int FastRouteCore::edgeShiftNew(Tree& t, int net)
           }
           numShift += edgeShift(t, net);
         }
-      }  // if(isPair)
+      }
 
-    }  // if(pairCnt>0)
-    else
+    } else {
       iter = 3;
-
-  }  // while
+    }
+  }
 
   return (numShift);
 }
diff --git a/src/grt/test/congestion1.guideok b/src/grt/test/congestion1.guideok
index 57e3a8a4133..35589e5b5b7 100644
--- a/src/grt/test/congestion1.guideok
+++ b/src/grt/test/congestion1.guideok
@@ -338,8 +338,10 @@ _045_
 (
 84000 121800 88200 126000 metal1
 84000 117600 88200 126000 metal2
-84000 117600 88200 121800 metal1
-84000 117600 92400 121800 metal1
+84000 117600 88200 121800 metal2
+84000 117600 92400 121800 metal3
+88200 117600 92400 121800 metal2
+88200 117600 92400 121800 metal1
 )
 _046_
 (
@@ -352,8 +354,10 @@ _046_
 )
 _047_
 (
-117600 134400 126000 138600 metal1
-121800 134400 126000 138600 metal1
+117600 134400 121800 138600 metal1
+117600 134400 121800 138600 metal2
+117600 134400 126000 138600 metal3
+121800 134400 126000 138600 metal2
 121800 134400 126000 147000 metal2
 121800 142800 126000 147000 metal1
 )
@@ -561,8 +565,10 @@ _071_
 )
 _072_
 (
-105000 42000 113400 46200 metal1
-109200 42000 113400 46200 metal1
+105000 42000 109200 46200 metal1
+105000 42000 109200 46200 metal2
+105000 42000 113400 46200 metal3
+109200 42000 113400 46200 metal2
 109200 42000 113400 54600 metal2
 109200 50400 113400 54600 metal2
 109200 50400 117600 54600 metal3
@@ -714,8 +720,10 @@ _091_
 (
 58800 67200 63000 71400 metal1
 58800 67200 63000 79800 metal2
-58800 75600 63000 79800 metal1
-58800 75600 67200 79800 metal1
+58800 75600 63000 79800 metal2
+58800 75600 67200 79800 metal3
+63000 75600 67200 79800 metal2
+63000 75600 67200 79800 metal1
 )
 _092_
 (
@@ -860,7 +868,6 @@ _110_
 142800 130200 151200 134400 metal3
 147000 130200 151200 134400 metal2
 147000 130200 151200 138600 metal2
-147000 134400 151200 138600 metal1
 105000 134400 109200 138600 metal1
 105000 126000 109200 138600 metal2
 105000 126000 109200 130200 metal1
@@ -873,18 +880,27 @@ _110_
 147000 151200 155400 155400 metal3
 151200 151200 155400 155400 metal2
 151200 134400 155400 155400 metal2
+147000 134400 151200 138600 metal1
+147000 134400 151200 138600 metal2
+147000 134400 155400 138600 metal3
+151200 134400 155400 138600 metal2
 151200 134400 155400 138600 metal1
-147000 134400 155400 138600 metal1
 )
 _111_
 (
-67200 63000 79800 67200 metal1
-75600 63000 79800 67200 metal1
+67200 63000 71400 67200 metal1
+67200 63000 71400 67200 metal2
+67200 63000 79800 67200 metal3
+75600 63000 79800 67200 metal2
 75600 63000 79800 71400 metal2
 75600 67200 79800 71400 metal1
-75600 67200 84000 71400 metal1
-63000 63000 71400 67200 metal1
+75600 67200 79800 71400 metal2
+75600 67200 84000 71400 metal3
+79800 67200 84000 71400 metal2
 79800 67200 84000 71400 metal1
+63000 63000 67200 67200 metal1
+63000 63000 67200 67200 metal2
+63000 63000 71400 67200 metal3
 79800 63000 84000 71400 metal2
 79800 63000 84000 67200 metal1
 )
@@ -896,13 +912,13 @@ _112_
 100800 63000 109200 67200 metal3
 105000 63000 109200 67200 metal2
 105000 63000 109200 67200 metal1
-117600 63000 121800 71400 metal1
+117600 63000 121800 71400 metal2
+117600 67200 121800 71400 metal1
 105000 58800 109200 67200 metal2
 105000 58800 109200 63000 metal2
 105000 58800 121800 63000 metal3
 117600 58800 121800 63000 metal2
 117600 58800 121800 67200 metal2
-117600 63000 121800 67200 metal1
 117600 63000 121800 67200 metal2
 117600 63000 126000 67200 metal3
 121800 63000 126000 67200 metal2
@@ -910,16 +926,14 @@ _112_
 )
 _113_
 (
-113400 46200 117600 50400 metal1
 113400 46200 117600 50400 metal2
 109200 46200 117600 50400 metal3
 109200 46200 113400 50400 metal2
 109200 46200 113400 50400 metal1
-105000 54600 109200 58800 metal1
 105000 54600 109200 63000 metal2
-105000 58800 109200 63000 metal1
-105000 58800 117600 63000 metal1
-113400 58800 117600 63000 metal1
+105000 58800 109200 63000 metal2
+105000 58800 117600 63000 metal3
+113400 58800 117600 63000 metal2
 113400 58800 117600 67200 metal2
 113400 63000 117600 67200 metal1
 105000 50400 109200 54600 metal1
@@ -928,10 +942,14 @@ _113_
 105000 46200 113400 50400 metal3
 113400 46200 117600 54600 metal2
 109200 50400 117600 54600 metal2
-109200 50400 113400 54600 metal1
-109200 50400 113400 58800 metal1
-105000 54600 113400 58800 metal1
-113400 46200 121800 50400 metal1
+109200 50400 113400 54600 metal2
+109200 50400 113400 58800 metal3
+105000 54600 113400 58800 metal3
+105000 54600 109200 58800 metal2
+105000 54600 109200 58800 metal1
+113400 46200 121800 50400 metal3
+117600 46200 121800 50400 metal2
+117600 46200 121800 50400 metal1
 )
 _114_
 (
@@ -967,8 +985,10 @@ _115_
 79800 37800 84000 42000 metal2
 79800 37800 84000 42000 metal1
 75600 50400 79800 58800 metal2
-75600 54600 79800 58800 metal1
-75600 54600 84000 58800 metal1
+75600 54600 79800 58800 metal2
+75600 54600 84000 58800 metal3
+79800 54600 84000 58800 metal2
+79800 54600 84000 58800 metal1
 71400 37800 75600 54600 metal2
 71400 50400 75600 54600 metal2
 71400 50400 79800 54600 metal3
@@ -978,8 +998,8 @@ _115_
 63000 42000 71400 46200 metal3
 63000 42000 67200 46200 metal2
 63000 37800 67200 46200 metal2
-63000 37800 67200 42000 metal1
-63000 37800 75600 42000 metal1
+63000 37800 67200 42000 metal2
+63000 37800 75600 42000 metal3
 75600 50400 84000 54600 metal3
 79800 50400 84000 54600 metal2
 79800 50400 84000 54600 metal1
@@ -1011,19 +1031,26 @@ _117_
 84000 113400 88200 117600 metal2
 84000 113400 96600 117600 metal3
 92400 113400 96600 117600 metal2
-92400 113400 96600 117600 metal1
 92400 117600 96600 121800 metal1
 92400 113400 96600 121800 metal2
-92400 126000 96600 130200 metal1
 92400 126000 96600 134400 metal2
 92400 130200 96600 134400 metal1
-88200 126000 96600 130200 metal1
-92400 113400 105000 117600 metal1
+88200 126000 92400 130200 metal1
+88200 126000 92400 130200 metal2
+88200 126000 96600 130200 metal3
+92400 126000 96600 130200 metal2
+92400 113400 105000 117600 metal3
+100800 113400 105000 117600 metal2
+100800 113400 105000 117600 metal1
 92400 117600 96600 130200 metal2
 )
 _118_
 (
-105000 147000 117600 151200 metal1
+105000 147000 109200 151200 metal1
+105000 147000 109200 151200 metal2
+105000 147000 117600 151200 metal3
+113400 147000 117600 151200 metal2
+113400 147000 117600 151200 metal1
 100800 138600 105000 142800 metal1
 100800 138600 105000 142800 metal2
 100800 138600 113400 142800 metal3
@@ -1031,9 +1058,9 @@ _118_
 109200 134400 113400 142800 metal2
 113400 121800 117600 126000 metal1
 113400 121800 117600 130200 metal2
-113400 126000 117600 130200 metal1
-113400 126000 121800 130200 metal1
-117600 126000 121800 130200 metal1
+113400 126000 117600 130200 metal2
+113400 126000 121800 130200 metal3
+117600 126000 121800 130200 metal2
 117600 126000 121800 134400 metal2
 117600 130200 121800 134400 metal1
 109200 134400 113400 138600 metal1
@@ -1044,13 +1071,10 @@ _118_
 100800 138600 105000 151200 metal2
 100800 147000 105000 151200 metal2
 100800 147000 109200 151200 metal3
-105000 147000 109200 151200 metal2
-105000 147000 109200 151200 metal1
 )
 _119_
 (
 121800 130200 126000 138600 metal2
-121800 134400 126000 138600 metal1
 117600 113400 121800 117600 metal1
 117600 113400 121800 121800 metal2
 117600 117600 121800 121800 metal1
@@ -1072,18 +1096,22 @@ _119_
 117600 130200 126000 134400 metal3
 121800 130200 126000 134400 metal2
 121800 130200 126000 134400 metal1
-121800 134400 130200 138600 metal1
+121800 134400 126000 138600 metal2
+121800 134400 130200 138600 metal3
+126000 134400 130200 138600 metal2
+126000 134400 130200 138600 metal1
 )
 _120_
 (
 147000 84000 151200 96600 metal2
 147000 92400 151200 96600 metal1
-155400 79800 159600 84000 metal1
 155400 79800 159600 100800 metal2
 155400 96600 159600 100800 metal1
 147000 79800 151200 88200 metal2
-147000 79800 151200 84000 metal1
-147000 79800 159600 84000 metal1
+147000 79800 151200 84000 metal2
+147000 79800 159600 84000 metal3
+155400 79800 159600 84000 metal2
+155400 79800 159600 84000 metal1
 142800 79800 147000 88200 metal2
 142800 79800 147000 84000 metal1
 142800 84000 147000 88200 metal1
@@ -1094,7 +1122,6 @@ _120_
 _121_
 (
 147000 100800 151200 109200 metal2
-147000 105000 151200 109200 metal1
 147000 100800 151200 105000 metal1
 147000 100800 151200 105000 metal2
 147000 100800 159600 105000 metal3
@@ -1103,8 +1130,10 @@ _121_
 155400 100800 159600 117600 metal2
 155400 96600 159600 105000 metal2
 155400 96600 159600 100800 metal1
-142800 105000 151200 109200 metal1
-142800 105000 147000 109200 metal1
+147000 105000 151200 109200 metal1
+147000 105000 151200 109200 metal2
+142800 105000 151200 109200 metal3
+142800 105000 147000 109200 metal2
 142800 105000 147000 117600 metal2
 142800 113400 147000 117600 metal2
 142800 113400 151200 117600 metal3
@@ -1114,19 +1143,21 @@ _121_
 _122_
 (
 130200 71400 134400 88200 metal2
-130200 84000 134400 88200 metal1
 130200 71400 134400 75600 metal1
 130200 71400 134400 75600 metal2
 130200 71400 138600 75600 metal3
 134400 71400 138600 75600 metal2
 134400 71400 138600 75600 metal1
-117600 92400 130200 96600 metal1
-126000 92400 130200 96600 metal1
-126000 84000 130200 96600 metal2
-126000 84000 130200 88200 metal1
-126000 84000 134400 88200 metal1
-130200 84000 134400 92400 metal1
 117600 92400 121800 96600 metal1
+117600 92400 121800 96600 metal2
+117600 92400 130200 96600 metal3
+126000 92400 130200 96600 metal2
+126000 84000 130200 96600 metal2
+126000 84000 130200 88200 metal2
+126000 84000 134400 88200 metal3
+130200 84000 134400 88200 metal2
+130200 84000 134400 92400 metal2
+130200 88200 134400 92400 metal1
 117600 88200 121800 96600 metal2
 117600 88200 121800 92400 metal1
 )
@@ -1162,9 +1193,9 @@ _124_
 67200 88200 71400 92400 metal1
 54600 100800 58800 105000 metal1
 54600 96600 58800 105000 metal2
-54600 96600 58800 100800 metal1
-54600 96600 63000 100800 metal1
-58800 96600 63000 100800 metal1
+54600 96600 58800 100800 metal2
+54600 96600 63000 100800 metal3
+58800 96600 63000 100800 metal2
 58800 92400 63000 100800 metal2
 67200 88200 71400 96600 metal2
 67200 92400 71400 96600 metal1
@@ -1189,11 +1220,12 @@ _125_
 )
 _126_
 (
-105000 121800 109200 126000 metal1
 105000 117600 109200 126000 metal2
 105000 117600 109200 121800 metal1
-105000 121800 113400 126000 metal1
-109200 121800 113400 126000 metal1
+105000 121800 109200 126000 metal1
+105000 121800 109200 126000 metal2
+105000 121800 113400 126000 metal3
+109200 121800 113400 126000 metal2
 109200 121800 113400 134400 metal2
 109200 130200 113400 134400 metal2
 105000 130200 113400 134400 metal3
@@ -1228,17 +1260,22 @@ _128_
 75600 71400 79800 75600 metal2
 75600 71400 92400 75600 metal3
 88200 71400 92400 75600 metal2
-105000 71400 109200 75600 metal1
 105000 67200 109200 75600 metal2
-105000 67200 109200 71400 metal1
-105000 71400 113400 75600 metal1
+109200 71400 113400 75600 metal1
+109200 71400 113400 75600 metal2
+105000 71400 113400 75600 metal3
+105000 71400 109200 75600 metal2
 88200 67200 92400 75600 metal2
 88200 67200 92400 71400 metal1
 88200 71400 96600 75600 metal3
 92400 71400 96600 75600 metal2
 92400 71400 96600 75600 metal1
-100800 67200 109200 71400 metal1
-92400 71400 109200 75600 metal1
+105000 67200 109200 71400 metal1
+105000 67200 109200 71400 metal2
+100800 67200 109200 71400 metal3
+100800 67200 105000 71400 metal2
+100800 67200 105000 71400 metal1
+92400 71400 109200 75600 metal3
 )
 _129_
 (
@@ -1271,19 +1308,24 @@ _130_
 92400 63000 105000 67200 metal3
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 _131_
 (
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 _140_
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 _141_
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 _142_
 (
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 )
 _149_
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 _150_
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 _151_
 (
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 _156_
 (
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 _159_
 (
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 _160_
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 _161_
 (
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 _162_
 (
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 _246_
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@@ -4452,8 +4656,13 @@ _353_
 54600 96600 58800 155400 metal2
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 )
 _354_
 (
@@ -4556,9 +4765,9 @@ _367_
 (
 71400 37800 75600 42000 metal1
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@@ -4587,9 +4796,9 @@ _370_
 67200 58800 88200 63000 metal3
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@@ -4632,8 +4841,10 @@ _371_
 )
 _372_
 (
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@@ -4707,9 +4918,9 @@ _377_
 (
 109200 100800 113400 105000 metal1
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@@ -4748,13 +4959,13 @@ _380_
 58800 16800 84000 21000 metal3
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@@ -4772,12 +4983,14 @@ _380_
 71400 126000 84000 130200 metal3
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 )
 _381_
 (
@@ -4819,12 +5032,14 @@ _381_
 151200 42000 159600 46200 metal3
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 )
 _382_
 (
@@ -4848,9 +5063,9 @@ _384_
 (
 84000 172200 88200 176400 metal1
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@@ -4860,20 +5075,22 @@ _384_
 )
 _385_
 (
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@@ -4895,9 +5112,9 @@ _385_
 176400 134400 189000 138600 metal3
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@@ -4916,8 +5133,10 @@ _386_
 42000 88200 58800 92400 metal3
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 )
 _387_
 (
@@ -4940,9 +5159,9 @@ _388_
 130200 193200 176400 197400 metal3
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@@ -4952,9 +5171,9 @@ _388_
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@@ -4980,17 +5199,17 @@ _388_
 126000 54600 134400 58800 metal3
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 113400 84000 117600 88200 metal1
 )
@@ -5046,9 +5265,9 @@ _392_
 25200 58800 63000 63000 metal3
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 )
@@ -5095,9 +5314,9 @@ _396_
 (
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@@ -5144,9 +5363,9 @@ _397_
 121800 50400 134400 54600 metal3
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 117600 84000 121800 92400 metal2
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 )
@@ -5192,11 +5411,10 @@ _401_
 79800 100800 84000 105000 metal2
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@@ -5208,7 +5426,6 @@ _401_
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@@ -5221,9 +5438,9 @@ _401_
 33600 71400 50400 75600 metal3
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@@ -5232,13 +5449,14 @@ _401_
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@@ -5258,7 +5476,10 @@ _401_
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@@ -5274,8 +5495,10 @@ _402_
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@@ -5288,11 +5511,13 @@ _402_
 )
 _403_
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@@ -5300,8 +5525,6 @@ _403_
 54600 109200 58800 117600 metal2
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 )
 _404_
 (
@@ -5310,9 +5533,9 @@ _404_
 92400 121800 100800 126000 metal3
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@@ -5355,12 +5578,14 @@ _406_
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 _407_
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 )
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 _411_
 (
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@@ -5432,8 +5661,10 @@ _411_
 _412_
 (
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@@ -5475,13 +5706,13 @@ _415_
 (
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 )
 _416_
 (
@@ -5515,8 +5746,10 @@ _418_
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@@ -5551,14 +5784,17 @@ _420_
 )
 _421_
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@@ -5584,13 +5820,13 @@ _421_
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 clk
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 50400 105000 54600 121800 metal2
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@@ -5599,10 +5835,11 @@ clk
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@@ -5660,9 +5897,9 @@ clk
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@@ -5673,8 +5910,8 @@ clk
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@@ -5706,21 +5943,26 @@ clk
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+105000 75600 109200 79800 metal1
+105000 75600 109200 79800 metal2
+105000 75600 113400 79800 metal3
 109200 75600 113400 79800 metal2
 109200 75600 130200 79800 metal3
 126000 75600 130200 79800 metal2
-134400 63000 142800 67200 metal1
-138600 63000 142800 67200 metal1
+134400 63000 138600 67200 metal2
+134400 63000 142800 67200 metal3
+138600 63000 142800 67200 metal2
 138600 50400 142800 67200 metal2
 138600 50400 142800 54600 metal2
 138600 50400 147000 54600 metal3
@@ -5738,8 +5980,6 @@ clk
 163800 105000 168000 109200 metal2
 126000 63000 130200 67200 metal2
 126000 63000 138600 67200 metal3
-134400 63000 138600 67200 metal2
-134400 63000 138600 67200 metal1
 92400 193200 96600 197400 metal2
 92400 193200 134400 197400 metal3
 130200 193200 134400 197400 metal2
@@ -6194,8 +6434,10 @@ net24
 33600 105000 50400 109200 metal3
 46200 105000 50400 109200 metal2
 46200 100800 50400 109200 metal2
-46200 100800 50400 105000 metal1
-46200 100800 54600 105000 metal1
+46200 100800 50400 105000 metal2
+46200 100800 54600 105000 metal3
+50400 100800 54600 105000 metal2
+50400 100800 54600 105000 metal1
 )
 net25
 (
@@ -6282,20 +6524,22 @@ net32
 155400 134400 176400 138600 metal3
 172200 134400 176400 138600 metal2
 172200 134400 176400 142800 metal2
-172200 138600 176400 142800 metal1
-172200 138600 180600 142800 metal1
+172200 138600 176400 142800 metal2
+172200 138600 180600 142800 metal3
+176400 138600 180600 142800 metal2
+176400 138600 180600 142800 metal1
 )
 net33
 (
 79800 130200 84000 134400 metal1
 79800 130200 84000 142800 metal2
-79800 138600 84000 142800 metal1
-75600 138600 84000 142800 metal1
-75600 138600 79800 142800 metal1
+79800 138600 84000 142800 metal2
+75600 138600 84000 142800 metal3
+75600 138600 79800 142800 metal2
 75600 138600 79800 155400 metal2
-75600 151200 79800 155400 metal1
-75600 151200 84000 155400 metal1
-79800 151200 84000 155400 metal1
+75600 151200 79800 155400 metal2
+75600 151200 84000 155400 metal3
+79800 151200 84000 155400 metal2
 79800 151200 84000 163800 metal2
 79800 159600 84000 163800 metal2
 79800 159600 92400 163800 metal3
@@ -6336,9 +6580,9 @@ net36
 42000 105000 50400 109200 metal3
 46200 105000 50400 109200 metal2
 46200 105000 50400 113400 metal2
-46200 109200 50400 113400 metal1
-46200 109200 63000 113400 metal1
-58800 109200 63000 113400 metal1
+46200 109200 50400 113400 metal2
+46200 109200 63000 113400 metal3
+58800 109200 63000 113400 metal2
 58800 105000 63000 113400 metal2
 58800 105000 63000 109200 metal1
 16800 21000 21000 25200 metal1
@@ -6347,9 +6591,9 @@ net36
 12600 25200 21000 29400 metal3
 12600 25200 16800 29400 metal2
 12600 25200 16800 92400 metal2
-12600 88200 16800 92400 metal1
-12600 88200 21000 92400 metal1
-16800 88200 21000 92400 metal1
+12600 88200 16800 92400 metal2
+12600 88200 21000 92400 metal3
+16800 88200 21000 92400 metal2
 16800 88200 21000 105000 metal2
 16800 100800 21000 105000 metal2
 16800 100800 46200 105000 metal3
@@ -6388,9 +6632,9 @@ net39
 (
 100800 25200 105000 29400 metal1
 100800 21000 105000 29400 metal2
-100800 21000 105000 25200 metal1
-100800 21000 109200 25200 metal1
-105000 21000 109200 25200 metal1
+100800 21000 105000 25200 metal2
+100800 21000 109200 25200 metal3
+105000 21000 109200 25200 metal2
 105000 16800 109200 25200 metal2
 105000 16800 109200 21000 metal2
 105000 16800 138600 21000 metal3
@@ -6449,9 +6693,9 @@ net43
 (
 84000 79800 88200 84000 metal1
 84000 79800 88200 88200 metal2
-84000 84000 88200 88200 metal1
-79800 84000 88200 88200 metal1
-79800 84000 84000 88200 metal1
+84000 84000 88200 88200 metal2
+79800 84000 88200 88200 metal3
+79800 84000 84000 88200 metal2
 79800 84000 84000 92400 metal2
 79800 88200 84000 92400 metal2
 21000 88200 84000 92400 metal3
@@ -6481,8 +6725,10 @@ net43
 105000 12600 117600 16800 metal3
 113400 12600 117600 16800 metal2
 113400 12600 117600 25200 metal2
-113400 21000 117600 25200 metal1
-113400 21000 121800 25200 metal1
+113400 21000 117600 25200 metal2
+113400 21000 121800 25200 metal3
+117600 21000 121800 25200 metal2
+117600 21000 121800 25200 metal1
 )
 net44
 (
@@ -6492,28 +6738,30 @@ net44
 16800 113400 54600 117600 metal3
 50400 113400 54600 117600 metal2
 50400 109200 54600 117600 metal2
-50400 109200 54600 113400 metal1
-50400 109200 67200 113400 metal1
-63000 109200 67200 113400 metal1
+50400 109200 54600 113400 metal2
+50400 109200 67200 113400 metal3
+63000 109200 67200 113400 metal2
 63000 105000 67200 113400 metal2
-63000 105000 67200 109200 metal1
-63000 105000 75600 109200 metal1
+63000 105000 67200 109200 metal2
+63000 105000 75600 109200 metal3
+71400 105000 75600 109200 metal2
+71400 105000 75600 109200 metal1
 )
 net45
 (
 155400 121800 159600 126000 metal1
 155400 121800 159600 138600 metal2
-155400 134400 159600 138600 metal1
-155400 134400 163800 138600 metal1
-159600 134400 163800 138600 metal1
+155400 134400 159600 138600 metal2
+155400 134400 163800 138600 metal3
+159600 134400 163800 138600 metal2
 159600 134400 163800 147000 metal2
 159600 142800 163800 147000 metal2
 159600 142800 168000 147000 metal3
 163800 142800 168000 147000 metal2
 163800 142800 168000 151200 metal2
-163800 147000 168000 151200 metal1
-163800 147000 176400 151200 metal1
-172200 147000 176400 151200 metal1
+163800 147000 168000 151200 metal2
+163800 147000 176400 151200 metal3
+172200 147000 176400 151200 metal2
 172200 147000 176400 180600 metal2
 172200 176400 176400 180600 metal1
 )
@@ -6546,9 +6794,9 @@ net47
 159600 92400 168000 96600 metal3
 163800 92400 168000 96600 metal2
 163800 84000 168000 96600 metal2
-163800 84000 168000 88200 metal1
-163800 84000 176400 88200 metal1
-172200 84000 176400 88200 metal1
+163800 84000 168000 88200 metal2
+163800 84000 176400 88200 metal3
+172200 84000 176400 88200 metal2
 172200 33600 176400 88200 metal2
 172200 33600 176400 37800 metal1
 )
@@ -6607,8 +6855,10 @@ net50
 16800 134400 79800 138600 metal3
 75600 134400 79800 138600 metal2
 75600 130200 79800 138600 metal2
-75600 130200 79800 134400 metal1
-75600 130200 84000 134400 metal1
+75600 130200 79800 134400 metal2
+75600 130200 84000 134400 metal3
+79800 130200 84000 134400 metal2
+79800 130200 84000 134400 metal1
 )
 net51
 (
@@ -6628,24 +6878,26 @@ net52
 16800 159600 88200 163800 metal3
 84000 159600 88200 163800 metal2
 84000 147000 88200 163800 metal2
-84000 147000 88200 151200 metal1
-84000 147000 96600 151200 metal1
-92400 147000 96600 151200 metal1
+84000 147000 88200 151200 metal2
+84000 147000 96600 151200 metal3
+92400 147000 96600 151200 metal2
 92400 134400 96600 151200 metal2
 92400 134400 96600 138600 metal1
 )
 net53
 (
-67200 54600 79800 58800 metal1
-67200 54600 71400 58800 metal1
+75600 54600 79800 58800 metal1
+75600 54600 79800 58800 metal2
+67200 54600 79800 58800 metal3
+67200 54600 71400 58800 metal2
 67200 25200 71400 58800 metal2
-67200 25200 71400 29400 metal1
-67200 25200 75600 29400 metal1
-71400 25200 75600 29400 metal1
+67200 25200 71400 29400 metal2
+67200 25200 75600 29400 metal3
+71400 25200 75600 29400 metal2
 71400 21000 75600 29400 metal2
-71400 21000 75600 25200 metal1
-71400 21000 79800 25200 metal1
-75600 21000 79800 25200 metal1
+71400 21000 75600 25200 metal2
+71400 21000 79800 25200 metal3
+75600 21000 79800 25200 metal2
 75600 12600 79800 25200 metal2
 75600 12600 79800 16800 metal2
 75600 12600 159600 16800 metal3
@@ -6655,9 +6907,9 @@ net53
 155400 42000 163800 46200 metal3
 159600 42000 163800 46200 metal2
 159600 42000 163800 50400 metal2
-159600 46200 163800 50400 metal1
-159600 46200 168000 50400 metal1
-163800 46200 168000 50400 metal1
+159600 46200 163800 50400 metal2
+159600 46200 168000 50400 metal3
+163800 46200 168000 50400 metal2
 163800 46200 168000 54600 metal2
 163800 50400 168000 54600 metal2
 163800 50400 176400 54600 metal3
diff --git a/src/grt/test/congestion1.ok b/src/grt/test/congestion1.ok
index f241b193a15..715a5b4623f 100644
--- a/src/grt/test/congestion1.ok
+++ b/src/grt/test/congestion1.ok
@@ -44,18 +44,18 @@ metal10    Vertical         2305             0          100.00%
 
 [INFO GRT-0101] Running extra iterations to remove overflow.
 [INFO GRT-0103] Extra Run for hard benchmark.
-[INFO GRT-0197] Via related to pin nodes: 2626
-[INFO GRT-0198] Via related Steiner nodes: 111
+[INFO GRT-0197] Via related to pin nodes: 2964
+[INFO GRT-0198] Via related Steiner nodes: 88
 [INFO GRT-0199] Via filling finished.
-[INFO GRT-0111] Final number of vias: 4288
-[INFO GRT-0112] Final usage 3D: 17759
+[INFO GRT-0111] Final number of vias: 4672
+[INFO GRT-0112] Final usage 3D: 18911
 
 [INFO GRT-0096] Final congestion report:
 Layer         Resource        Demand        Usage (%)    Max H / Max V / Total Overflow
 ---------------------------------------------------------------------------------------
-metal1               0           405            0.00%             4 /  1 / 405
-metal2            2209          2450          110.91%             1 /  5 / 784
-metal3            2208          2040           92.39%             3 /  1 / 407
+metal1               0             0            0.00%             0 /  0 /  0
+metal2            2209          2463          111.50%             1 /  5 / 797
+metal3            2208          2432          110.14%             5 /  2 / 799
 metal4               0             0            0.00%             0 /  0 /  0
 metal5               0             0            0.00%             0 /  0 /  0
 metal6               0             0            0.00%             0 /  0 /  0
@@ -64,7 +64,7 @@ metal8               0             0            0.00%             0 /  0 /  0
 metal9               0             0            0.00%             0 /  0 /  0
 metal10              0             0            0.00%             0 /  0 /  0
 ---------------------------------------------------------------------------------------
-Total             4417          4895          110.82%             8 /  7 / 1596
+Total             4417          4895          110.82%             6 /  7 / 1596
 
 [INFO GRT-0018] Total wirelength: 14939 um
 [INFO GRT-0014] Routed nets: 563
diff --git a/src/grt/test/congestion5.ok b/src/grt/test/congestion5.ok
index 8ec7152eb94..187bdea1515 100644
--- a/src/grt/test/congestion5.ok
+++ b/src/grt/test/congestion5.ok
@@ -44,18 +44,18 @@ metal10    Vertical         2305             0          100.00%
 
 [INFO GRT-0101] Running extra iterations to remove overflow.
 [INFO GRT-0103] Extra Run for hard benchmark.
-[INFO GRT-0197] Via related to pin nodes: 1798
-[INFO GRT-0198] Via related Steiner nodes: 96
+[INFO GRT-0197] Via related to pin nodes: 2774
+[INFO GRT-0198] Via related Steiner nodes: 69
 [INFO GRT-0199] Via filling finished.
-[INFO GRT-0111] Final number of vias: 3375
-[INFO GRT-0112] Final usage 3D: 15394
+[INFO GRT-0111] Final number of vias: 4557
+[INFO GRT-0112] Final usage 3D: 18940
 
 [INFO GRT-0096] Final congestion report:
 Layer         Resource        Demand        Usage (%)    Max H / Max V / Total Overflow
 ---------------------------------------------------------------------------------------
-metal1               0          1616            0.00%             7 /  1 / 1616
-metal2            6721          3633           54.05%             1 /  5 / 442
-metal3               0             8            0.00%             1 /  0 /  8
+metal1               0             0            0.00%             0 /  0 /  0
+metal2            6721          3643           54.20%             1 /  5 / 452
+metal3               0          1614            0.00%             7 /  1 / 1614
 metal4               0             0            0.00%             0 /  0 /  0
 metal5               0            12            0.00%             1 /  0 / 12
 metal6               0             0            0.00%             0 /  0 /  0
@@ -64,7 +64,7 @@ metal8               0             0            0.00%             0 /  0 /  0
 metal9               0             0            0.00%             0 /  0 /  0
 metal10              0             0            0.00%             0 /  0 /  0
 ---------------------------------------------------------------------------------------
-Total             6721          5269           78.40%            10 /  6 / 2078
+Total             6721          5269           78.40%             9 /  6 / 2078
 
 [INFO GRT-0018] Total wirelength: 16130 um
 [INFO GRT-0014] Routed nets: 563
diff --git a/src/grt/test/congestion6.ok b/src/grt/test/congestion6.ok
index e9c57a6b426..563851b30fc 100644
--- a/src/grt/test/congestion6.ok
+++ b/src/grt/test/congestion6.ok
@@ -44,18 +44,18 @@ metal10    Vertical         2305             0          100.00%
 
 [INFO GRT-0101] Running extra iterations to remove overflow.
 [INFO GRT-0103] Extra Run for hard benchmark.
-[INFO GRT-0197] Via related to pin nodes: 3202
+[INFO GRT-0197] Via related to pin nodes: 3211
 [INFO GRT-0198] Via related Steiner nodes: 78
 [INFO GRT-0199] Via filling finished.
-[INFO GRT-0111] Final number of vias: 5078
-[INFO GRT-0112] Final usage 3D: 20579
+[INFO GRT-0111] Final number of vias: 5088
+[INFO GRT-0112] Final usage 3D: 20609
 
 [INFO GRT-0096] Final congestion report:
 Layer         Resource        Demand        Usage (%)    Max H / Max V / Total Overflow
 ---------------------------------------------------------------------------------------
-metal1               0             9            0.00%             1 /  0 /  9
+metal1               0             0            0.00%             0 /  0 /  0
 metal2            2209          1754           79.40%             0 /  2 / 283
-metal3            8832          3582           40.56%             2 /  1 / 85
+metal3            8832          3591           40.66%             2 /  1 / 94
 metal4               0             0            0.00%             0 /  0 /  0
 metal5               0             0            0.00%             0 /  0 /  0
 metal6               0             0            0.00%             0 /  0 /  0
@@ -64,7 +64,7 @@ metal8               0             0            0.00%             0 /  0 /  0
 metal9               0             0            0.00%             0 /  0 /  0
 metal10              0             0            0.00%             0 /  0 /  0
 ---------------------------------------------------------------------------------------
-Total            11041          5345           48.41%             3 /  3 / 377
+Total            11041          5345           48.41%             2 /  3 / 377
 
 [INFO GRT-0018] Total wirelength: 15907 um
 [INFO GRT-0014] Routed nets: 563
diff --git a/src/grt/test/congestion7.guideok b/src/grt/test/congestion7.guideok
index 57e3a8a4133..35589e5b5b7 100644
--- a/src/grt/test/congestion7.guideok
+++ b/src/grt/test/congestion7.guideok
@@ -338,8 +338,10 @@ _045_
 (
 84000 121800 88200 126000 metal1
 84000 117600 88200 126000 metal2
-84000 117600 88200 121800 metal1
-84000 117600 92400 121800 metal1
+84000 117600 88200 121800 metal2
+84000 117600 92400 121800 metal3
+88200 117600 92400 121800 metal2
+88200 117600 92400 121800 metal1
 )
 _046_
 (
@@ -352,8 +354,10 @@ _046_
 )
 _047_
 (
-117600 134400 126000 138600 metal1
-121800 134400 126000 138600 metal1
+117600 134400 121800 138600 metal1
+117600 134400 121800 138600 metal2
+117600 134400 126000 138600 metal3
+121800 134400 126000 138600 metal2
 121800 134400 126000 147000 metal2
 121800 142800 126000 147000 metal1
 )
@@ -561,8 +565,10 @@ _071_
 )
 _072_
 (
-105000 42000 113400 46200 metal1
-109200 42000 113400 46200 metal1
+105000 42000 109200 46200 metal1
+105000 42000 109200 46200 metal2
+105000 42000 113400 46200 metal3
+109200 42000 113400 46200 metal2
 109200 42000 113400 54600 metal2
 109200 50400 113400 54600 metal2
 109200 50400 117600 54600 metal3
@@ -714,8 +720,10 @@ _091_
 (
 58800 67200 63000 71400 metal1
 58800 67200 63000 79800 metal2
-58800 75600 63000 79800 metal1
-58800 75600 67200 79800 metal1
+58800 75600 63000 79800 metal2
+58800 75600 67200 79800 metal3
+63000 75600 67200 79800 metal2
+63000 75600 67200 79800 metal1
 )
 _092_
 (
@@ -860,7 +868,6 @@ _110_
 142800 130200 151200 134400 metal3
 147000 130200 151200 134400 metal2
 147000 130200 151200 138600 metal2
-147000 134400 151200 138600 metal1
 105000 134400 109200 138600 metal1
 105000 126000 109200 138600 metal2
 105000 126000 109200 130200 metal1
@@ -873,18 +880,27 @@ _110_
 147000 151200 155400 155400 metal3
 151200 151200 155400 155400 metal2
 151200 134400 155400 155400 metal2
+147000 134400 151200 138600 metal1
+147000 134400 151200 138600 metal2
+147000 134400 155400 138600 metal3
+151200 134400 155400 138600 metal2
 151200 134400 155400 138600 metal1
-147000 134400 155400 138600 metal1
 )
 _111_
 (
-67200 63000 79800 67200 metal1
-75600 63000 79800 67200 metal1
+67200 63000 71400 67200 metal1
+67200 63000 71400 67200 metal2
+67200 63000 79800 67200 metal3
+75600 63000 79800 67200 metal2
 75600 63000 79800 71400 metal2
 75600 67200 79800 71400 metal1
-75600 67200 84000 71400 metal1
-63000 63000 71400 67200 metal1
+75600 67200 79800 71400 metal2
+75600 67200 84000 71400 metal3
+79800 67200 84000 71400 metal2
 79800 67200 84000 71400 metal1
+63000 63000 67200 67200 metal1
+63000 63000 67200 67200 metal2
+63000 63000 71400 67200 metal3
 79800 63000 84000 71400 metal2
 79800 63000 84000 67200 metal1
 )
@@ -896,13 +912,13 @@ _112_
 100800 63000 109200 67200 metal3
 105000 63000 109200 67200 metal2
 105000 63000 109200 67200 metal1
-117600 63000 121800 71400 metal1
+117600 63000 121800 71400 metal2
+117600 67200 121800 71400 metal1
 105000 58800 109200 67200 metal2
 105000 58800 109200 63000 metal2
 105000 58800 121800 63000 metal3
 117600 58800 121800 63000 metal2
 117600 58800 121800 67200 metal2
-117600 63000 121800 67200 metal1
 117600 63000 121800 67200 metal2
 117600 63000 126000 67200 metal3
 121800 63000 126000 67200 metal2
@@ -910,16 +926,14 @@ _112_
 )
 _113_
 (
-113400 46200 117600 50400 metal1
 113400 46200 117600 50400 metal2
 109200 46200 117600 50400 metal3
 109200 46200 113400 50400 metal2
 109200 46200 113400 50400 metal1
-105000 54600 109200 58800 metal1
 105000 54600 109200 63000 metal2
-105000 58800 109200 63000 metal1
-105000 58800 117600 63000 metal1
-113400 58800 117600 63000 metal1
+105000 58800 109200 63000 metal2
+105000 58800 117600 63000 metal3
+113400 58800 117600 63000 metal2
 113400 58800 117600 67200 metal2
 113400 63000 117600 67200 metal1
 105000 50400 109200 54600 metal1
@@ -928,10 +942,14 @@ _113_
 105000 46200 113400 50400 metal3
 113400 46200 117600 54600 metal2
 109200 50400 117600 54600 metal2
-109200 50400 113400 54600 metal1
-109200 50400 113400 58800 metal1
-105000 54600 113400 58800 metal1
-113400 46200 121800 50400 metal1
+109200 50400 113400 54600 metal2
+109200 50400 113400 58800 metal3
+105000 54600 113400 58800 metal3
+105000 54600 109200 58800 metal2
+105000 54600 109200 58800 metal1
+113400 46200 121800 50400 metal3
+117600 46200 121800 50400 metal2
+117600 46200 121800 50400 metal1
 )
 _114_
 (
@@ -967,8 +985,10 @@ _115_
 79800 37800 84000 42000 metal2
 79800 37800 84000 42000 metal1
 75600 50400 79800 58800 metal2
-75600 54600 79800 58800 metal1
-75600 54600 84000 58800 metal1
+75600 54600 79800 58800 metal2
+75600 54600 84000 58800 metal3
+79800 54600 84000 58800 metal2
+79800 54600 84000 58800 metal1
 71400 37800 75600 54600 metal2
 71400 50400 75600 54600 metal2
 71400 50400 79800 54600 metal3
@@ -978,8 +998,8 @@ _115_
 63000 42000 71400 46200 metal3
 63000 42000 67200 46200 metal2
 63000 37800 67200 46200 metal2
-63000 37800 67200 42000 metal1
-63000 37800 75600 42000 metal1
+63000 37800 67200 42000 metal2
+63000 37800 75600 42000 metal3
 75600 50400 84000 54600 metal3
 79800 50400 84000 54600 metal2
 79800 50400 84000 54600 metal1
@@ -1011,19 +1031,26 @@ _117_
 84000 113400 88200 117600 metal2
 84000 113400 96600 117600 metal3
 92400 113400 96600 117600 metal2
-92400 113400 96600 117600 metal1
 92400 117600 96600 121800 metal1
 92400 113400 96600 121800 metal2
-92400 126000 96600 130200 metal1
 92400 126000 96600 134400 metal2
 92400 130200 96600 134400 metal1
-88200 126000 96600 130200 metal1
-92400 113400 105000 117600 metal1
+88200 126000 92400 130200 metal1
+88200 126000 92400 130200 metal2
+88200 126000 96600 130200 metal3
+92400 126000 96600 130200 metal2
+92400 113400 105000 117600 metal3
+100800 113400 105000 117600 metal2
+100800 113400 105000 117600 metal1
 92400 117600 96600 130200 metal2
 )
 _118_
 (
-105000 147000 117600 151200 metal1
+105000 147000 109200 151200 metal1
+105000 147000 109200 151200 metal2
+105000 147000 117600 151200 metal3
+113400 147000 117600 151200 metal2
+113400 147000 117600 151200 metal1
 100800 138600 105000 142800 metal1
 100800 138600 105000 142800 metal2
 100800 138600 113400 142800 metal3
@@ -1031,9 +1058,9 @@ _118_
 109200 134400 113400 142800 metal2
 113400 121800 117600 126000 metal1
 113400 121800 117600 130200 metal2
-113400 126000 117600 130200 metal1
-113400 126000 121800 130200 metal1
-117600 126000 121800 130200 metal1
+113400 126000 117600 130200 metal2
+113400 126000 121800 130200 metal3
+117600 126000 121800 130200 metal2
 117600 126000 121800 134400 metal2
 117600 130200 121800 134400 metal1
 109200 134400 113400 138600 metal1
@@ -1044,13 +1071,10 @@ _118_
 100800 138600 105000 151200 metal2
 100800 147000 105000 151200 metal2
 100800 147000 109200 151200 metal3
-105000 147000 109200 151200 metal2
-105000 147000 109200 151200 metal1
 )
 _119_
 (
 121800 130200 126000 138600 metal2
-121800 134400 126000 138600 metal1
 117600 113400 121800 117600 metal1
 117600 113400 121800 121800 metal2
 117600 117600 121800 121800 metal1
@@ -1072,18 +1096,22 @@ _119_
 117600 130200 126000 134400 metal3
 121800 130200 126000 134400 metal2
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 _129_
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 _131_
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 _162_
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 _229_
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@@ -2912,8 +3047,10 @@ _237_
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 _238_
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@@ -3052,22 +3196,18 @@ _245_
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@@ -3081,14 +3221,16 @@ _245_
 109200 84000 113400 88200 metal2
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 )
 _246_
 (
@@ -3115,11 +3257,10 @@ _248_
 58800 92400 63000 96600 metal1
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@@ -3136,32 +3277,40 @@ _248_
 130200 63000 134400 75600 metal2
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@@ -3171,8 +3320,6 @@ _248_
 42000 42000 46200 63000 metal2
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@@ -3211,9 +3358,9 @@ _249_
 92400 130200 96600 134400 metal1
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@@ -3234,8 +3381,11 @@ _249_
 168000 130200 172200 134400 metal2
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@@ -3252,9 +3402,9 @@ _249_
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 105000 79800 117600 84000 metal3
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@@ -3283,16 +3433,15 @@ _249_
 100800 138600 105000 142800 metal2
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@@ -3329,20 +3478,20 @@ _251_
 )
 _252_
 (
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@@ -3351,12 +3500,13 @@ _252_
 100800 33600 105000 37800 metal2
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@@ -3366,20 +3516,20 @@ _252_
 54600 33600 79800 37800 metal3
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 )
 _253_
 (
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 168000 113400 176400 117600 metal3
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 130200 79800 134400 84000 metal1
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 168000 96600 172200 100800 metal2
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@@ -3463,7 +3617,11 @@ _253_
 117600 75600 121800 79800 metal2
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 )
 _254_
 (
@@ -3488,8 +3646,10 @@ _256_
 (
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 _257_
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 (
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 _274_
 (
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 _275_
 (
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 _276_
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 _278_
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 (
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 _298_
 (
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 _303_
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@@ -3921,13 +4101,17 @@ _306_
 63000 84000 71400 88200 metal3
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 _307_
 (
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 _309_
 (
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 _317_
 (
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 _318_
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 _319_
 (
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 _320_
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 _328_
 (
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 _332_
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 (
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 _349_
 (
@@ -4305,8 +4503,10 @@ _350_
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 _351_
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 _354_
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 _381_
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 _387_
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 79800 130200 105000 134400 metal3
@@ -5475,13 +5706,13 @@ _415_
 (
 142800 109200 147000 113400 metal1
 142800 100800 147000 113400 metal2
-142800 100800 147000 105000 metal1
 142800 100800 147000 105000 metal2
 142800 100800 163800 105000 metal3
 159600 100800 163800 105000 metal2
 159600 92400 163800 105000 metal2
 159600 92400 163800 96600 metal1
-142800 96600 147000 105000 metal1
+142800 96600 147000 105000 metal2
+142800 96600 147000 100800 metal1
 )
 _416_
 (
@@ -5515,8 +5746,10 @@ _418_
 75600 92400 79800 96600 metal1
 75600 92400 79800 100800 metal2
 75600 96600 79800 100800 metal1
-67200 105000 75600 109200 metal1
-71400 105000 75600 109200 metal1
+67200 105000 71400 109200 metal1
+67200 105000 71400 109200 metal2
+67200 105000 75600 109200 metal3
+71400 105000 75600 109200 metal2
 71400 100800 75600 109200 metal2
 71400 100800 75600 105000 metal2
 71400 100800 79800 105000 metal3
@@ -5551,14 +5784,17 @@ _420_
 )
 _421_
 (
-58800 113400 63000 121800 metal1
-58800 113400 63000 117600 metal1
+58800 117600 63000 121800 metal2
+58800 113400 63000 121800 metal3
+58800 113400 63000 117600 metal2
 58800 113400 67200 117600 metal2
-63000 113400 67200 117600 metal1
-63000 109200 67200 117600 metal1
-63000 109200 71400 113400 metal1
-58800 121800 67200 126000 metal1
-58800 121800 63000 126000 metal1
+63000 113400 67200 117600 metal2
+63000 109200 67200 117600 metal3
+63000 109200 71400 113400 metal3
+67200 109200 71400 113400 metal2
+67200 109200 71400 113400 metal1
+58800 121800 67200 126000 metal2
+63000 121800 67200 126000 metal1
 58800 121800 63000 126000 metal2
 42000 121800 63000 126000 metal3
 42000 121800 46200 126000 metal2
@@ -5584,13 +5820,13 @@ _421_
 71400 54600 75600 58800 metal2
 71400 54600 75600 58800 metal1
 58800 117600 63000 126000 metal2
-58800 117600 63000 121800 metal1
-58800 117600 71400 121800 metal1
+58800 117600 71400 121800 metal3
+67200 117600 71400 121800 metal2
+67200 117600 71400 121800 metal1
 )
 clk
 (
 50400 105000 54600 121800 metal2
-50400 117600 54600 121800 metal1
 63000 96600 67200 109200 metal2
 63000 96600 67200 100800 metal1
 92400 142800 96600 151200 metal2
@@ -5599,10 +5835,11 @@ clk
 105000 142800 109200 147000 metal2
 105000 142800 109200 147000 metal1
 126000 130200 130200 142800 metal2
-126000 130200 130200 134400 metal1
-126000 130200 138600 134400 metal1
-134400 121800 138600 134400 metal2
+126000 130200 130200 134400 metal2
+126000 130200 138600 134400 metal3
+134400 130200 138600 134400 metal2
 134400 130200 138600 134400 metal1
+134400 121800 138600 134400 metal2
 130200 121800 134400 126000 metal1
 130200 121800 134400 126000 metal2
 130200 121800 138600 126000 metal3
@@ -5660,9 +5897,9 @@ clk
 163800 75600 172200 79800 metal3
 168000 75600 172200 79800 metal2
 168000 75600 172200 105000 metal2
-168000 100800 172200 105000 metal1
-163800 100800 172200 105000 metal1
-163800 100800 168000 105000 metal1
+168000 100800 172200 105000 metal2
+163800 100800 172200 105000 metal3
+163800 100800 168000 105000 metal2
 163800 100800 168000 109200 metal2
 151200 75600 155400 79800 metal1
 151200 67200 155400 79800 metal2
@@ -5673,8 +5910,8 @@ clk
 54600 58800 58800 63000 metal2
 54600 58800 63000 63000 metal3
 58800 58800 63000 63000 metal2
-100800 29400 113400 33600 metal1
-109200 29400 113400 33600 metal1
+100800 29400 113400 33600 metal3
+109200 29400 113400 33600 metal2
 109200 25200 113400 33600 metal2
 109200 25200 113400 29400 metal2
 109200 25200 117600 29400 metal3
@@ -5706,21 +5943,26 @@ clk
 92400 147000 105000 151200 metal3
 100800 147000 105000 151200 metal2
 100800 147000 105000 151200 metal1
-50400 117600 58800 121800 metal1
-113400 50400 121800 54600 metal1
-117600 50400 121800 54600 metal1
+50400 117600 58800 121800 metal2
+54600 117600 58800 121800 metal1
+113400 50400 117600 54600 metal1
+113400 50400 117600 54600 metal2
+113400 50400 121800 54600 metal3
+117600 50400 121800 54600 metal2
 117600 46200 121800 54600 metal2
 151200 117600 155400 121800 metal1
 151200 117600 155400 134400 metal2
 151200 75600 155400 88200 metal2
 151200 84000 155400 88200 metal1
-105000 75600 113400 79800 metal1
-109200 75600 113400 79800 metal1
+105000 75600 109200 79800 metal1
+105000 75600 109200 79800 metal2
+105000 75600 113400 79800 metal3
 109200 75600 113400 79800 metal2
 109200 75600 130200 79800 metal3
 126000 75600 130200 79800 metal2
-134400 63000 142800 67200 metal1
-138600 63000 142800 67200 metal1
+134400 63000 138600 67200 metal2
+134400 63000 142800 67200 metal3
+138600 63000 142800 67200 metal2
 138600 50400 142800 67200 metal2
 138600 50400 142800 54600 metal2
 138600 50400 147000 54600 metal3
@@ -5738,8 +5980,6 @@ clk
 163800 105000 168000 109200 metal2
 126000 63000 130200 67200 metal2
 126000 63000 138600 67200 metal3
-134400 63000 138600 67200 metal2
-134400 63000 138600 67200 metal1
 92400 193200 96600 197400 metal2
 92400 193200 134400 197400 metal3
 130200 193200 134400 197400 metal2
@@ -6194,8 +6434,10 @@ net24
 33600 105000 50400 109200 metal3
 46200 105000 50400 109200 metal2
 46200 100800 50400 109200 metal2
-46200 100800 50400 105000 metal1
-46200 100800 54600 105000 metal1
+46200 100800 50400 105000 metal2
+46200 100800 54600 105000 metal3
+50400 100800 54600 105000 metal2
+50400 100800 54600 105000 metal1
 )
 net25
 (
@@ -6282,20 +6524,22 @@ net32
 155400 134400 176400 138600 metal3
 172200 134400 176400 138600 metal2
 172200 134400 176400 142800 metal2
-172200 138600 176400 142800 metal1
-172200 138600 180600 142800 metal1
+172200 138600 176400 142800 metal2
+172200 138600 180600 142800 metal3
+176400 138600 180600 142800 metal2
+176400 138600 180600 142800 metal1
 )
 net33
 (
 79800 130200 84000 134400 metal1
 79800 130200 84000 142800 metal2
-79800 138600 84000 142800 metal1
-75600 138600 84000 142800 metal1
-75600 138600 79800 142800 metal1
+79800 138600 84000 142800 metal2
+75600 138600 84000 142800 metal3
+75600 138600 79800 142800 metal2
 75600 138600 79800 155400 metal2
-75600 151200 79800 155400 metal1
-75600 151200 84000 155400 metal1
-79800 151200 84000 155400 metal1
+75600 151200 79800 155400 metal2
+75600 151200 84000 155400 metal3
+79800 151200 84000 155400 metal2
 79800 151200 84000 163800 metal2
 79800 159600 84000 163800 metal2
 79800 159600 92400 163800 metal3
@@ -6336,9 +6580,9 @@ net36
 42000 105000 50400 109200 metal3
 46200 105000 50400 109200 metal2
 46200 105000 50400 113400 metal2
-46200 109200 50400 113400 metal1
-46200 109200 63000 113400 metal1
-58800 109200 63000 113400 metal1
+46200 109200 50400 113400 metal2
+46200 109200 63000 113400 metal3
+58800 109200 63000 113400 metal2
 58800 105000 63000 113400 metal2
 58800 105000 63000 109200 metal1
 16800 21000 21000 25200 metal1
@@ -6347,9 +6591,9 @@ net36
 12600 25200 21000 29400 metal3
 12600 25200 16800 29400 metal2
 12600 25200 16800 92400 metal2
-12600 88200 16800 92400 metal1
-12600 88200 21000 92400 metal1
-16800 88200 21000 92400 metal1
+12600 88200 16800 92400 metal2
+12600 88200 21000 92400 metal3
+16800 88200 21000 92400 metal2
 16800 88200 21000 105000 metal2
 16800 100800 21000 105000 metal2
 16800 100800 46200 105000 metal3
@@ -6388,9 +6632,9 @@ net39
 (
 100800 25200 105000 29400 metal1
 100800 21000 105000 29400 metal2
-100800 21000 105000 25200 metal1
-100800 21000 109200 25200 metal1
-105000 21000 109200 25200 metal1
+100800 21000 105000 25200 metal2
+100800 21000 109200 25200 metal3
+105000 21000 109200 25200 metal2
 105000 16800 109200 25200 metal2
 105000 16800 109200 21000 metal2
 105000 16800 138600 21000 metal3
@@ -6449,9 +6693,9 @@ net43
 (
 84000 79800 88200 84000 metal1
 84000 79800 88200 88200 metal2
-84000 84000 88200 88200 metal1
-79800 84000 88200 88200 metal1
-79800 84000 84000 88200 metal1
+84000 84000 88200 88200 metal2
+79800 84000 88200 88200 metal3
+79800 84000 84000 88200 metal2
 79800 84000 84000 92400 metal2
 79800 88200 84000 92400 metal2
 21000 88200 84000 92400 metal3
@@ -6481,8 +6725,10 @@ net43
 105000 12600 117600 16800 metal3
 113400 12600 117600 16800 metal2
 113400 12600 117600 25200 metal2
-113400 21000 117600 25200 metal1
-113400 21000 121800 25200 metal1
+113400 21000 117600 25200 metal2
+113400 21000 121800 25200 metal3
+117600 21000 121800 25200 metal2
+117600 21000 121800 25200 metal1
 )
 net44
 (
@@ -6492,28 +6738,30 @@ net44
 16800 113400 54600 117600 metal3
 50400 113400 54600 117600 metal2
 50400 109200 54600 117600 metal2
-50400 109200 54600 113400 metal1
-50400 109200 67200 113400 metal1
-63000 109200 67200 113400 metal1
+50400 109200 54600 113400 metal2
+50400 109200 67200 113400 metal3
+63000 109200 67200 113400 metal2
 63000 105000 67200 113400 metal2
-63000 105000 67200 109200 metal1
-63000 105000 75600 109200 metal1
+63000 105000 67200 109200 metal2
+63000 105000 75600 109200 metal3
+71400 105000 75600 109200 metal2
+71400 105000 75600 109200 metal1
 )
 net45
 (
 155400 121800 159600 126000 metal1
 155400 121800 159600 138600 metal2
-155400 134400 159600 138600 metal1
-155400 134400 163800 138600 metal1
-159600 134400 163800 138600 metal1
+155400 134400 159600 138600 metal2
+155400 134400 163800 138600 metal3
+159600 134400 163800 138600 metal2
 159600 134400 163800 147000 metal2
 159600 142800 163800 147000 metal2
 159600 142800 168000 147000 metal3
 163800 142800 168000 147000 metal2
 163800 142800 168000 151200 metal2
-163800 147000 168000 151200 metal1
-163800 147000 176400 151200 metal1
-172200 147000 176400 151200 metal1
+163800 147000 168000 151200 metal2
+163800 147000 176400 151200 metal3
+172200 147000 176400 151200 metal2
 172200 147000 176400 180600 metal2
 172200 176400 176400 180600 metal1
 )
@@ -6546,9 +6794,9 @@ net47
 159600 92400 168000 96600 metal3
 163800 92400 168000 96600 metal2
 163800 84000 168000 96600 metal2
-163800 84000 168000 88200 metal1
-163800 84000 176400 88200 metal1
-172200 84000 176400 88200 metal1
+163800 84000 168000 88200 metal2
+163800 84000 176400 88200 metal3
+172200 84000 176400 88200 metal2
 172200 33600 176400 88200 metal2
 172200 33600 176400 37800 metal1
 )
@@ -6607,8 +6855,10 @@ net50
 16800 134400 79800 138600 metal3
 75600 134400 79800 138600 metal2
 75600 130200 79800 138600 metal2
-75600 130200 79800 134400 metal1
-75600 130200 84000 134400 metal1
+75600 130200 79800 134400 metal2
+75600 130200 84000 134400 metal3
+79800 130200 84000 134400 metal2
+79800 130200 84000 134400 metal1
 )
 net51
 (
@@ -6628,24 +6878,26 @@ net52
 16800 159600 88200 163800 metal3
 84000 159600 88200 163800 metal2
 84000 147000 88200 163800 metal2
-84000 147000 88200 151200 metal1
-84000 147000 96600 151200 metal1
-92400 147000 96600 151200 metal1
+84000 147000 88200 151200 metal2
+84000 147000 96600 151200 metal3
+92400 147000 96600 151200 metal2
 92400 134400 96600 151200 metal2
 92400 134400 96600 138600 metal1
 )
 net53
 (
-67200 54600 79800 58800 metal1
-67200 54600 71400 58800 metal1
+75600 54600 79800 58800 metal1
+75600 54600 79800 58800 metal2
+67200 54600 79800 58800 metal3
+67200 54600 71400 58800 metal2
 67200 25200 71400 58800 metal2
-67200 25200 71400 29400 metal1
-67200 25200 75600 29400 metal1
-71400 25200 75600 29400 metal1
+67200 25200 71400 29400 metal2
+67200 25200 75600 29400 metal3
+71400 25200 75600 29400 metal2
 71400 21000 75600 29400 metal2
-71400 21000 75600 25200 metal1
-71400 21000 79800 25200 metal1
-75600 21000 79800 25200 metal1
+71400 21000 75600 25200 metal2
+71400 21000 79800 25200 metal3
+75600 21000 79800 25200 metal2
 75600 12600 79800 25200 metal2
 75600 12600 79800 16800 metal2
 75600 12600 159600 16800 metal3
@@ -6655,9 +6907,9 @@ net53
 155400 42000 163800 46200 metal3
 159600 42000 163800 46200 metal2
 159600 42000 163800 50400 metal2
-159600 46200 163800 50400 metal1
-159600 46200 168000 50400 metal1
-163800 46200 168000 50400 metal1
+159600 46200 163800 50400 metal2
+159600 46200 168000 50400 metal3
+163800 46200 168000 50400 metal2
 163800 46200 168000 54600 metal2
 163800 50400 168000 54600 metal2
 163800 50400 176400 54600 metal3
diff --git a/src/grt/test/congestion7.ok b/src/grt/test/congestion7.ok
index 58c017b3274..dd051827807 100644
--- a/src/grt/test/congestion7.ok
+++ b/src/grt/test/congestion7.ok
@@ -44,18 +44,18 @@ metal10    Vertical         2305             0          100.00%
 
 [INFO GRT-0101] Running extra iterations to remove overflow.
 [INFO GRT-0103] Extra Run for hard benchmark.
-[INFO GRT-0197] Via related to pin nodes: 2626
-[INFO GRT-0198] Via related Steiner nodes: 111
+[INFO GRT-0197] Via related to pin nodes: 2964
+[INFO GRT-0198] Via related Steiner nodes: 88
 [INFO GRT-0199] Via filling finished.
-[INFO GRT-0111] Final number of vias: 4288
-[INFO GRT-0112] Final usage 3D: 17759
+[INFO GRT-0111] Final number of vias: 4672
+[INFO GRT-0112] Final usage 3D: 18911
 
 [INFO GRT-0096] Final congestion report:
 Layer         Resource        Demand        Usage (%)    Max H / Max V / Total Overflow
 ---------------------------------------------------------------------------------------
-metal1               0           405            0.00%             4 /  1 / 405
-metal2            2209          2450          110.91%             1 /  5 / 784
-metal3            2208          2040           92.39%             3 /  1 / 407
+metal1               0             0            0.00%             0 /  0 /  0
+metal2            2209          2463          111.50%             1 /  5 / 797
+metal3            2208          2432          110.14%             5 /  2 / 799
 metal4               0             0            0.00%             0 /  0 /  0
 metal5               0             0            0.00%             0 /  0 /  0
 metal6               0             0            0.00%             0 /  0 /  0
@@ -64,7 +64,7 @@ metal8               0             0            0.00%             0 /  0 /  0
 metal9               0             0            0.00%             0 /  0 /  0
 metal10              0             0            0.00%             0 /  0 /  0
 ---------------------------------------------------------------------------------------
-Total             4417          4895          110.82%             8 /  7 / 1596
+Total             4417          4895          110.82%             6 /  7 / 1596
 
 [INFO GRT-0018] Total wirelength: 14939 um
 [INFO GRT-0014] Routed nets: 563