You are spot on. I'm pretty new to bowling and after bowling for 3 years, last week it clicked. At first I could not clear my thumb clean doing the release. I figured that I was gripping the ball too much. Therefore, after a couple of open bowling games of this I made it a point to really relax my hand. Like you, the thumb comes out clean and the fingers turn creating more revs and carry for that matter as this even improved the ball entry angle to the pocket. It is still a work in progress as I need more practice to develop muscle memory I suppose.
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