Alright Carl, here you go:

I used to throw my Arsenal (and spare ball) with my thumb halfway in the ball.  Because of the lack of support, I also had to grip it.  I found that lately I have been blistering on the left side of my thumb (I am right handed).  I tried to fully insert my thumb into the ball(s), but the thumbhole was too tight a fit, and I either couldn't get out of it, or threw it with about 4 revs down the lane.  I also have a Brunswick Riot Zone Purple Pearl, which is 13 pounds and has a much bigger thumbhole.  I can throw that ball without blistering.

I recently opened my Arsenal’s thumbhole so that I can now fully insert my thumb without it sticking (almost an entire personal size, actually). However, because my thumb is further into the ball, it looks like I have lost about half the revs I couldn’t spare.

I went open bowling yesterday. I threw it (the Artillery) for about a game-and-a-half before my thumb started blistering again. However, the blister was significantly smaller than it was before I opened up the thumb(slug). In the sixth or seventh frame of my second game, I switched to my Riot Zone.  The Riot Zone is a ball that was not designed to handle as much oil as the Artillery, but what I found was that the Purple Pearl actually hooked MORE because I could put more revs on the ball, however, my track was lower. I don’t know why the Riot Zone out-hooked the Arsenal yesterday. The only differences between these two balls (besides the coverstocks and cores) are the bigger thumbhole on the Riot Zone, and weight difference (the Arsenal Artillery is a heavy 14). I can’t imagine I was throwing slower; the Purple Pearl is lighter than what I’m used to. Does anyone have any thoughts?
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I'll give you five bucks off 'cause you look like a guy who knows his BALLS!