I haven't followed up on the latest IBPSIA fitting techniques (haven't worked in a pro shop in 9 years), but Mo Pinel recently did a hand analysis to help me cut down my axis rotation.  He actually rolled all pitches (fingers and thumb) right which seems counterintuitive and against what's considered the "norm".  He explained that it allowed the weight of the ball to fall towards the outside (index finger) side of the hand which helps prevent the hand from rotating around the ball.  He changed me from 3/8 <- and 3/8 -> in the fingers to 1/16 <- and 11/16 ->  The thumb was changed from 1/8 <- to 1/4 ->.  If you hold your hand palm up, you can see that the majority of the weight will fall to the inside and will help in rotation so if you want to increase rotation you roll pitches to the left for a righthander.

I admit that I was skeptical but it definately has made a difference. I'm able to lower my rotation (i.e getting closer to 0*) much easier and my natural rotation has dropped a few degrees. Thus, I'm getting better reads and not so much reaction down at the end of the pattern.  

I don't know if this is just Mo's performance fitting technique or industry standard.  YMMV.
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Anthony Chapman
Track International Staff
Turbo Grips 2-N-1 Staff