diff --git a/sh/scenarios/chainspecs/client.chainspec.toml.override b/sh/scenarios/chainspecs/client.chainspec.toml.override
new file mode 100644
index 0000000..ee7ab31
--- /dev/null
+++ b/sh/scenarios/chainspecs/client.chainspec.toml.override
@@ -0,0 +1,2 @@
+[transactions.v1]
+wasm_lanes = [[2, 1_048_576, 2048, 1_000_000_000_000, 1], [3, 104857600, 1024, 500_000_000_000, 3], [4, 172_032, 1024, 50_000_000_000, 7], [5, 12_288, 512, 1_500_000_000, 15]]
diff --git a/sh/scenarios/chainspecs/event_stream.chainspec.toml.override b/sh/scenarios/chainspecs/event_stream.chainspec.toml.override
new file mode 100644
index 0000000..ee7ab31
--- /dev/null
+++ b/sh/scenarios/chainspecs/event_stream.chainspec.toml.override
@@ -0,0 +1,2 @@
+[transactions.v1]
+wasm_lanes = [[2, 1_048_576, 2048, 1_000_000_000_000, 1], [3, 104857600, 1024, 500_000_000_000, 3], [4, 172_032, 1024, 50_000_000_000, 7], [5, 12_288, 512, 1_500_000_000, 15]]
diff --git a/sh/scenarios/chainspecs/swap_validator_set.chainspec.toml.override b/sh/scenarios/chainspecs/swap_validator_set.chainspec.toml.override
index b080a17..7d32595 100644
--- a/sh/scenarios/chainspecs/swap_validator_set.chainspec.toml.override
+++ b/sh/scenarios/chainspecs/swap_validator_set.chainspec.toml.override
@@ -3,3 +3,6 @@ round_seigniorage_rate = [0, 1]
 locked_funds_period = '0days'
 validator_slots = 5
 vesting_schedule_period = '0days'
+
+[transactions.v1]
+wasm_lanes = [[2, 1_048_576, 2048, 1_000_000_000_000, 1], [3, 104857600, 1024, 500_000_000_000, 3], [4, 172_032, 1024, 50_000_000_000, 7], [5, 12_288, 512, 1_500_000_000, 15]]
diff --git a/sh/scenarios/chainspecs/sync_upgrade_test.chainspec.toml.override b/sh/scenarios/chainspecs/sync_upgrade_test.chainspec.toml.override
new file mode 100644
index 0000000..ee7ab31
--- /dev/null
+++ b/sh/scenarios/chainspecs/sync_upgrade_test.chainspec.toml.override
@@ -0,0 +1,2 @@
+[transactions.v1]
+wasm_lanes = [[2, 1_048_576, 2048, 1_000_000_000_000, 1], [3, 104857600, 1024, 500_000_000_000, 3], [4, 172_032, 1024, 50_000_000_000, 7], [5, 12_288, 512, 1_500_000_000, 15]]
diff --git a/sh/scenarios/client.sh b/sh/scenarios/client.sh
index 1e184ca..ce1cdf5 100755
--- a/sh/scenarios/client.sh
+++ b/sh/scenarios/client.sh
@@ -1312,8 +1312,8 @@ function get_chainspec_from_rpc() {
     OUTPUT=$($(get_path_to_client) get-chainspec \
         --node-address "$(get_node_address_rpc)" \
         -vv \
-        | sed -n '/\[protocol\]/,$p' \
-        | sed '/FAUCET/Q')
+        | awk '/\[.+\]/{flag=1} flag' \
+        | awk '/FAUCET/{exit} {print}')
 
     # Check non-empty
     check_client_responded "$OUTPUT"
@@ -1341,7 +1341,7 @@ function get_chainspec_json_from_rpc() {
     OUTPUT=$($(get_path_to_client) get-chainspec \
         --node-address "$(get_node_address_rpc)" \
         -vv \
-        | sed '/\[protocol\]/Q')
+        | awk '/\[.+\]/{exit} {print}')
 
     # Check non-empty
     check_client_responded "$OUTPUT"
diff --git a/sh/scenarios/common/itst.sh b/sh/scenarios/common/itst.sh
index 2206aa2..b10b7d9 100644
--- a/sh/scenarios/common/itst.sh
+++ b/sh/scenarios/common/itst.sh
@@ -473,6 +473,7 @@ function assert_node_proposed() {
         fi
 
         PROPOSER=$(echo "$BLOCK" | jq -r '.header.proposer')
+        HEIGHT=$(echo "$BLOCK" | jq -r '.header.height')
 
         if [ "$PROPOSER" == "$PUBLIC_KEY_HEX" ]; then
             log "Node-$NODE_ID created a block!"
@@ -480,6 +481,7 @@ function assert_node_proposed() {
             log "Proposer: $PROPOSER"
             break;
         else
+            log "Block $HEIGHT proposed by $PROPOSER, but we need one from $PUBLIC_KEY_HEX"
             sleep 1
             TIMEOUT=$((TIMEOUT-1))
             if [ "$TIMEOUT" = '0' ]; then
diff --git a/sh/scenarios/validators_disconnect.sh b/sh/scenarios/validators_disconnect.sh
index 8b62664..3d108d0 100644
--- a/sh/scenarios/validators_disconnect.sh
+++ b/sh/scenarios/validators_disconnect.sh
@@ -41,7 +41,7 @@ function main() {
     nctl-start node=6
     nctl-start node=7
     # 7. Check if the network is progressing
-    do_await_era_change_with_timeout 1 "500"
+    do_await_era_change_with_timeout 1 "1500"
     source "$NCTL"/sh/scenarios/common/health_checks.sh \
             errors=0 \
             equivocators=0 \