Actually no a bit lower is better.

Content.Shared/Slippery/SlipperyComponent.cs

@@ -20,7 +20,7 @@ namespace Content.Shared.Slippery
 
         private float _paralyzeTime = 5f;
         private float _intersectPercentage = 0.3f;
-        private float _requiredSlipSpeed = 4f;
+        private float _requiredSlipSpeed = 3.5f;
         private float _launchForwardsMultiplier = 1f;
         private bool _slippery = true;
         private SoundSpecifier _slipSound = new SoundPathSpecifier("/Audio/Effects/slip.ogg");