diff --git a/examples/capella-mev.yaml b/examples/capella-mev.yaml
index ef6a178b6..c8724cd75 100644
--- a/examples/capella-mev.yaml
+++ b/examples/capella-mev.yaml
@@ -1,21 +1,18 @@
 mev_type: full
 participants:
 - el_client_type: geth
-  el_client_image: ethereum/client-go:latest
-  el_client_log_level: ''
   cl_client_type: lighthouse
-  cl_client_log_level: ''
-  cl_client_image: sigp/lighthouse
-  el_extra_params: []
+  cl_client_image: ethpandaops/lighthouse:unstable-c55608b
   beacon_extra_params:
   - "--always-prefer-builder-payload"
   - "--disable-peer-scoring"
-network_params:
-  capella_fork_epoch: 0
-  seconds_per_slot: 12
+network_config:
+  deneb_fork_epoch: 1
 mev_params:
   mev_flood_seconds_per_bundle: 12
   mev_flood_extra_args:
   - "--txsPerBundle=300"
   mev_flood_image: flashbots/mev-flood:0.0.9
-  mev_relay_image: flashbots/mev-boost-relay:0.27.0
+  mev_relay_image: flashbots/mev-boost-relay:0.28.0a7
+  mev_boost_image: flashbots/mev-boost:1.6.4844.dev5
+  mev_builder_image: flashbots/builder:1.13.2.4844.dev7-4d161de
diff --git a/main.star b/main.star
index ece3db15d..9ed7b8917 100644
--- a/main.star
+++ b/main.star
@@ -1,7 +1,7 @@
 input_parser = import_module("./src/package_io/input_parser.star")
 constants = import_module("./src/package_io/constants.star")
 participant_network = import_module("./src/participant_network.star")
-
+shared_utils = import_module("./src/shared_utils/shared_utils.star")
 static_files = import_module("./src/static_files/static_files.star")
 genesis_constants = import_module(
     "./src/prelaunch_data_generator/genesis_constants/genesis_constants.star"
@@ -239,13 +239,16 @@ def run(plan, args={}):
     all_mevboost_contexts = []
     if mev_endpoints:
         for index, participant in enumerate(all_participants):
+            index_str = shared_utils.zfill_custom(
+                index + 1, len(str(len(all_participants)))
+            )
             if args_with_right_defaults.participants[index].validator_count != 0:
                 mev_boost_launcher = mev_boost.new_mev_boost_launcher(
                     MEV_BOOST_SHOULD_CHECK_RELAY, mev_endpoints
                 )
                 mev_boost_service_name = "{0}-{1}-{2}-{3}".format(
                     input_parser.MEV_BOOST_SERVICE_NAME_PREFIX,
-                    index,
+                    index_str,
                     participant.cl_client_type,
                     participant.el_client_type,
                 )
diff --git a/src/mev/mev_relay/mev_relay_launcher.star b/src/mev/mev_relay/mev_relay_launcher.star
index 02472857d..e56ec46bd 100644
--- a/src/mev/mev_relay/mev_relay_launcher.star
+++ b/src/mev/mev_relay/mev_relay_launcher.star
@@ -83,6 +83,8 @@ def launch_mev_relay(
         "DENEB_FORK_VERSION": constants.DENEB_FORK_VERSION,
         "GENESIS_VALIDATORS_ROOT": validator_root,
         "SEC_PER_SLOT": str(seconds_per_slot),
+        "LOG_LEVEL": "debug",
+        "DB_TABLE_PREFIX": "custom",
     }
 
     redis_url = "{}:{}".format(redis.hostname, redis.port_number)
diff --git a/src/package_io/input_parser.star b/src/package_io/input_parser.star
index 0f17bb9c3..a2101332f 100644
--- a/src/package_io/input_parser.star
+++ b/src/package_io/input_parser.star
@@ -1,5 +1,5 @@
-constants = import_module("../package_io/constants.star")
-
+constants = import_module("./constants.star")
+shared_utils = import_module("../shared_utils/shared_utils.star")
 genesis_constants = import_module(
     "../prelaunch_data_generator/genesis_constants/genesis_constants.star"
 )
@@ -517,9 +517,12 @@ def enrich_disable_peer_scoring(parsed_arguments_dict):
 # TODO perhaps clean this up into a map
 def enrich_mev_extra_params(parsed_arguments_dict, mev_prefix, mev_port, mev_type):
     for index, participant in enumerate(parsed_arguments_dict["participants"]):
+        index_str = shared_utils.zfill_custom(
+            index + 1, len(str(len(parsed_arguments_dict["participants"])))
+        )
         mev_url = "http://{0}-{1}-{2}-{3}:{4}".format(
             MEV_BOOST_SERVICE_NAME_PREFIX,
-            index,
+            index_str,
             participant["cl_client_type"],
             participant["el_client_type"],
             mev_port,
@@ -529,6 +532,7 @@ def enrich_mev_extra_params(parsed_arguments_dict, mev_prefix, mev_port, mev_typ
             participant["validator_extra_params"].append("--builder-proposals")
             participant["beacon_extra_params"].append("--builder={0}".format(mev_url))
         if participant["cl_client_type"] == "lodestar":
+            participant["validator_extra_params"].append("--builder")
             participant["beacon_extra_params"].append("--builder")
             participant["beacon_extra_params"].append(
                 "--builder.urls={0}".format(mev_url)
@@ -553,7 +557,9 @@ def enrich_mev_extra_params(parsed_arguments_dict, mev_prefix, mev_port, mev_typ
             )
 
     num_participants = len(parsed_arguments_dict["participants"])
-
+    index_str = shared_utils.zfill_custom(
+        num_participants + 1, len(str(num_participants + 1))
+    )
     if mev_type == "full":
         mev_participant = default_participant()
         mev_participant["el_client_type"] = (
@@ -577,8 +583,8 @@ def enrich_mev_extra_params(parsed_arguments_dict, mev_prefix, mev_port, mev_typ
                 "el_extra_params": [
                     "--builder",
                     "--builder.remote_relay_endpoint=http://mev-relay-api:9062",
-                    "--builder.beacon_endpoints=http://cl-{0}-lighthouse-geth:4000".format(
-                        num_participants + 1
+                    "--builder.beacon_endpoints=http://cl-{0}-lighthouse-geth-builder:4000".format(
+                        index_str
                     ),
                     "--builder.bellatrix_fork_version={0}".format(
                         constants.BELLATRIX_FORK_VERSION