diff --git a/src/Workflow/__Tests/StellaOps.Workflow.Renderer.Tests/DocumentProcessingWorkflowRenderingTests.Artifacts.cs b/src/Workflow/__Tests/StellaOps.Workflow.Renderer.Tests/DocumentProcessingWorkflowRenderingTests.Artifacts.cs
index 9c398aa4b..c1e66b367 100644
--- a/src/Workflow/__Tests/StellaOps.Workflow.Renderer.Tests/DocumentProcessingWorkflowRenderingTests.Artifacts.cs
+++ b/src/Workflow/__Tests/StellaOps.Workflow.Renderer.Tests/DocumentProcessingWorkflowRenderingTests.Artifacts.cs
@@ -40,7 +40,7 @@ public partial class DocumentProcessingWorkflowRenderingTests
         var layout = await engine.LayoutAsync(graph, new WorkflowRenderLayoutRequest
         {
             Direction = WorkflowRenderLayoutDirection.LeftToRight,
-            NodeSpacing = 40,
+            NodeSpacing = 50,
         });
 
         var svgRenderer = new WorkflowRenderSvgRenderer();
diff --git a/src/__Libraries/StellaOps.ElkSharp/ElkEdgeRouterIterative.Hybrid.cs b/src/__Libraries/StellaOps.ElkSharp/ElkEdgeRouterIterative.Hybrid.cs
index a3966f585..b8b920c4b 100644
--- a/src/__Libraries/StellaOps.ElkSharp/ElkEdgeRouterIterative.Hybrid.cs
+++ b/src/__Libraries/StellaOps.ElkSharp/ElkEdgeRouterIterative.Hybrid.cs
@@ -242,9 +242,16 @@ internal static partial class ElkEdgeRouterIterative
         var edgeOrder = useConnectedOrdering
             ? OrderByMostConnectedFirst(edges, connectionCount)
             : OrderByLongestFirst(edges, nodesById);
+        // Corridor grid spacing: use average node height so the A* grid cells
+        // are node-sized. Edges route through wide corridors between node rows,
+        // not through narrow gaps. The fine node-boundary lines (at obstacle
+        // edge ± 18px margin) still provide precise resolution near nodes.
+        var serviceNodesForGrid = nodes.Where(n => n.Kind is not "Start" and not "End").ToArray();
+        var avgNodeHeight = serviceNodesForGrid.Length > 0 ? serviceNodesForGrid.Average(n => n.Height) : 88d;
+        var corridorGridSpacing = Math.Max(40d, avgNodeHeight);
         var routingParams = baselineRetryState.RequiresBlockingRetry
-            ? new AStarRoutingParams(18d, 400d, 600d, 3.0d, minLineClearance, 40d, true)
-            : new AStarRoutingParams(18d, 200d, 500d, 2.0d, minLineClearance, 40d, true);
+            ? new AStarRoutingParams(18d, 400d, 600d, 3.0d, minLineClearance, corridorGridSpacing, true)
+            : new AStarRoutingParams(18d, 200d, 500d, 2.0d, minLineClearance, corridorGridSpacing, true);
         var strategy = new RoutingStrategy
         {
             EdgeOrder = edgeOrder,