slick,
Depends on what you mean by "cleaning up your release". You might just need some tape??? With your long span, doesn't sound like you have excessive reverse pitch. Depends on a couple different things. How limber is your thumb joint? Do you have a thick web from your thumb to index finger? Do you have a thick pad above your thumb in the palm of your hand? Is the span correct to begin with?
I'm also one of those "if it ain't broke, don't fix it" guys. If you are not getting blisters, pains, knots, etc.... Hanging up in the ball, dropping the ball..... Maybe your grip is good??? Kinda hard to tell without watching you and looking at your ball/thumb hole/grip....
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Mike Austin's Precision Pro Shop
Houston, TX
Drilling and Tech Advice BirdDogbowling.com
Driller to many "Stars" and Tony Melendez too!