diff --git a/.github/workflows/aggregator-stress-test.yml b/.github/workflows/aggregator-stress-test.yml
index 710e8fd0f1a..0ca28dea3c1 100644
--- a/.github/workflows/aggregator-stress-test.yml
+++ b/.github/workflows/aggregator-stress-test.yml
@@ -52,20 +52,26 @@ jobs:
           workflow: ci.yml
           workflow_conclusion: success
 
+      - name: Download test runners
+        uses: dawidd6/action-download-artifact@v3
+        with:
+          name: mithril-tooling-Linux-X64
+          path: ./bin
+          commit: ${{ inputs.commit_sha }}
+          workflow: ci.yml
+          workflow_conclusion: success
+
       - name: Set permissions
         shell: bash
         working-directory: ./bin
-        run: chmod +x ./mithril-aggregator
-
-      - name: Build the aggregator stress test
-        working-directory: mithril-test-lab/mithril-end-to-end
-        run: make build
+        run: |
+          chmod +x ./mithril-aggregator
+          chmod +x ./load-aggregator
 
       - name: Run the aggregator stress test
-        working-directory: mithril-test-lab/mithril-end-to-end
         run: |
-            ./load-aggregator ${{ steps.prepare.outputs.debug_level }} \
-            --cardano-cli-path script/mock-cardano-cli \
-            --aggregator-dir ../../bin \
+            ./bin/load-aggregator ${{ steps.prepare.outputs.debug_level }} \
+            --cardano-cli-path ./mithril-test-lab/mithril-end-to-end/script/mock-cardano-cli \
+            --aggregator-dir ./bin \
             --num-signers=${{ inputs.num_signers }} \
             --num-clients=${{ inputs.num_clients }}
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5cfa51ff7f7..07430887269 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -32,7 +32,7 @@ jobs:
       # We separate the build in 2 steps as we want to avoid side effects with Rust feature unification.
       - name: Cargo build - Tooling
         shell: bash
-        run: cargo build --release -p mithril-end-to-end
+        run: cargo build --release --bin mithril-end-to-end --bin load-aggregator
 
       - name: Build Mithril workspace & publish artifacts
         uses: ./.github/workflows/actions/build-upload-mithril-artifact
@@ -58,8 +58,10 @@ jobs:
       - name: Publish End-to-end runner (${{ runner.os }}-${{ runner.arch }})
         uses: actions/upload-artifact@v4
         with:
-          name: mithril-end-to-end-${{ runner.os }}-${{ runner.arch }}
-          path: target/release/mithril-end-to-end
+          name: mithril-tooling-${{ runner.os }}-${{ runner.arch }}
+          path: |
+            target/release/mithril-end-to-end
+            target/release/load-aggregator
           if-no-files-found: error
 
       - name: Prepare test lab eras
@@ -302,7 +304,7 @@ jobs:
       - name: Download rust test runner
         uses: actions/download-artifact@v4
         with:
-          name: mithril-end-to-end-${{ runner.os }}-${{ runner.arch }}
+          name: mithril-tooling-${{ runner.os }}-${{ runner.arch }}
           path: ./
 
       - run: |
diff --git a/mithril-test-lab/mithril-end-to-end/src/stress_test/aggregator_helpers.rs b/mithril-test-lab/mithril-end-to-end/src/stress_test/aggregator_helpers.rs
index dd462be0f24..ecfac461ee3 100644
--- a/mithril-test-lab/mithril-end-to-end/src/stress_test/aggregator_helpers.rs
+++ b/mithril-test-lab/mithril-end-to-end/src/stress_test/aggregator_helpers.rs
@@ -58,6 +58,16 @@ pub async fn bootstrap_aggregator(
     )
     .await?;
 
+    restart_aggregator_and_move_one_epoch_forward(&mut aggregator, current_epoch, args).await?;
+
+    fake_signer::try_register_signer_until_registration_round_is_open(
+        &aggregator,
+        &signers_fixture.signers()[0],
+        *current_epoch + 1,
+        Duration::from_secs(60),
+    )
+    .await?;
+
     info!(">> Send the Signer Key Registrations payloads for the genesis signers");
     let errors = fake_signer::register_signers_to_aggregator(
         &aggregator,
@@ -66,21 +76,17 @@ pub async fn bootstrap_aggregator(
     )
     .await?;
     assert_eq!(0, errors);
-    aggregator.stop().await.unwrap();
-
-    info!(">> Move one epoch forward in order to issue the genesis certificate");
-    *current_epoch += 1;
-    fake_chain::set_epoch(&args.mock_epoch_file_path(), *current_epoch);
 
-    info!(">> Restarting the aggregator still with a large run interval");
-    aggregator.serve().unwrap();
-    wait::for_http_response(
-        &format!("{}/epoch-settings", aggregator.endpoint()),
-        Duration::from_secs(10),
-        "Waiting for the aggregator to start",
+    fake_signer::try_register_signer_until_registration_round_is_open(
+        &aggregator,
+        &signers_fixture.signers()[0],
+        *current_epoch + 1,
+        Duration::from_secs(60),
     )
     .await?;
 
+    restart_aggregator_and_move_one_epoch_forward(&mut aggregator, current_epoch, args).await?;
+
     info!(">> Send the Signer Key Registrations payloads for next genesis signers");
     let errors = fake_signer::register_signers_to_aggregator(
         &aggregator,
@@ -115,3 +121,26 @@ pub async fn bootstrap_aggregator(
 
     Ok(aggregator)
 }
+
+async fn restart_aggregator_and_move_one_epoch_forward(
+    aggregator: &mut Aggregator,
+    current_epoch: &mut Epoch,
+    args: &AggregatorParameters,
+) -> StdResult<()> {
+    info!(">> Stop the aggregator to move one epoch forward");
+    aggregator.stop().await.unwrap();
+
+    *current_epoch += 1;
+    fake_chain::set_epoch(&args.mock_epoch_file_path(), *current_epoch);
+
+    info!(">> Restarting the aggregator with a large run interval");
+    aggregator.serve().unwrap();
+    wait::for_http_response(
+        &format!("{}/epoch-settings", aggregator.endpoint()),
+        Duration::from_secs(10),
+        "Waiting for the aggregator to start",
+    )
+    .await?;
+
+    Ok(())
+}
diff --git a/mithril-test-lab/mithril-end-to-end/src/stress_test/wait.rs b/mithril-test-lab/mithril-end-to-end/src/stress_test/wait.rs
index 5fb9f00d3cf..b387efc8d6a 100644
--- a/mithril-test-lab/mithril-end-to-end/src/stress_test/wait.rs
+++ b/mithril-test-lab/mithril-end-to-end/src/stress_test/wait.rs
@@ -48,7 +48,7 @@ where
             }
             _ => request_first_list_item_with_expected_size::<I>(url, expected_size).await,
         },
-        Err(err) => Err(anyhow!(err).context("Request to `{url}` failed")),
+        Err(err) => Err(anyhow!(err).context(format!("Request to `{url}` failed"))),
     }
 }