diff --git a/tests/GameCult.Caching.Tests/CachelessSingleFileTests.cs b/tests/GameCult.Caching.Tests/CachelessSingleFileTests.cs
index a501be67..acfff563 100644
--- a/tests/GameCult.Caching.Tests/CachelessSingleFileTests.cs
+++ b/tests/GameCult.Caching.Tests/CachelessSingleFileTests.cs
@@ -1456,10 +1456,13 @@ namespace GameCult.Caching.Tests
                 rounds++;
                 var store = new RoleStore(_path);
                 store.ReleaseAttach.Set();
+                // A cache holding many records makes the attach's checks before it publishes Cache take long enough to race.
                 var cache = new CultCache(registry);
+                for (var index = 0; index < 20000; index++)
+                    cache.Upsert(new IdDeck { Name = "held" + index });
                 using var barrier = new Barrier(2);
                 var takes = 0;
-                var spin = (round % 128) * 20;
+                var spin = (round % 200) * 400;
                 var caller = new Thread(() =>
                 {
                     barrier.SignalAndWait();
diff --git a/tests/GameCult.Caching.Tests/RestampOnWriteTests.cs b/tests/GameCult.Caching.Tests/RestampOnWriteTests.cs
index 83d808ca..1d5fcd23 100644
--- a/tests/GameCult.Caching.Tests/RestampOnWriteTests.cs
+++ b/tests/GameCult.Caching.Tests/RestampOnWriteTests.cs
@@ -54,7 +54,7 @@ namespace GameCult.Caching.Tests
             [Key(2)] public string Colour = string.Empty;
         }
 
-        private const string WideId = "sha256:f0d9ccd6e9a4a1c8b3a17f5b1ea1ce6b1fcd6a0f3ad1b28f2e1d4f7d91c0a2e3";
+        private const string WideId = "sha256:82c2b721aceb56e00288baab590fabcdd82c3bda44400f7530fa9e29c4e96252";
 
         private static readonly CultDocumentRegistry NarrowRegistry = CultDocumentRegistry.ForTypes(new[] { typeof(NoteNarrow) });
         private static readonly CultDocumentRegistry GrownRegistry = CultDocumentRegistry.ForTypes(new[] { typeof(NoteGrown) });