OK, maybe it’s just my ears but, following a thing I saw in this video about Haimu switches (Best Silent Switches. No rubber required. Haimu Heartbeat Linear | Whisper Tactile Review - YouTube) suggested by @Deadeye, I’ve created 2 small holes in the bottom of a spare Outemu Silent White, lubed and filmed as the others I’ve installed on my IK75 and… you tell me if you notice something or maybe it’s just my brain
(sorry for the quality, not the best one, I know)
Test 2, maybe you can hear the differences better (sorry for my breathing 
):