currently i have my thumb pitched away half an inch with no lateral pitch. I have always had callauses on the left side of my thumb that wraps around the entire side of my thumb. I am left handed, so to be clear if u were to hold up ur left thumb so it is pointing up my callause is on the left side. my question is, only recently it has begun hurting, most likely because i switched my thumb to the half away, before it was o front to back with a 1/8 laterl out to the right. i changed because i could not clear the front of the ball no matter how much bevel i used. so my question is will increasing the latteral out pitch relief or add pressure to the left of my thumb.
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I had the same problem, with callousing.
I went from 0, 0,...
to 3/16 Reverse, and 1/8 left lateral.
Without seeing you bowl, I can bet you have late timing, late thumb release.
Are squeezing the ball to hold on to it, and are topping the ball a bit.

I'd see a coach, and have some video shot of your game, with slow-mo of the release.

Deadbait, is pretty dead on.

Hard to figure out what's wrong without seeing you bowl...or at least see your hand.
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Duke Harding

"Anything is possible if you don't know what you are talking about."