Forgive my "ignorance", but am I the only one who is having a hard time following this "grammar"?
Here's a simple answer to your problem: Wherever the blister is, that's where you're rubbing. There will never be a blister if you are coming out of the thumb hole clean. So either your gripping the ball funny, or your span or pitches are off. It really is that simple...
--------------------
notclay