From what I've been told/read/discussed/whatever.
The more pressure you have to apply with the tip/pad of the thumb, the less likely you are to have a clean release - and at least in my case - the more you tear up the back/sides of your thumb. The more snug you have the thumbhole, the more you can relax the thumb to have a cleaner release.
If I remember, I think it was Ron C who said that you want the thumbhole so tight that the ball won't come off if you grip it, but it will come off if you're thumb is completely relaxed. Counterintuative I know, but hear me out on this.
If you grip with your thumb, you're flexing the muscles inside it - making it bigger. If you're thumb is relaxed, it's as small as it can get. So when you're at the release point in your swing, intertia will pull the ball off of your thumb more consistantly than if you have to consciously/subconsciously release your thumb pressure due to gripping.
The caveat to this is that if you have it too tight, the thumbhole could seal/create a vacuum which goes back to having either a not clean release, or a potential Machuga moment. Ergo the use of tape/magic carpet/ventholes to releave the vacuum potential.
It's a balance that is constantly needing to be tweaked, because humidity, season of the year, whether your thumb swells or shrinks when you bowl, etc..... I've personally not found my best fit yet, but it's getting there.
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