To start off, I already had a pretty good fit, I feel like fit is something I understand well.  (r)eVolve from Rico and Gary Yamasaki got really deep into fit, and put some things in ways that tweaked my thinking a bit and mostly gave me a lot more information than I previously had.  I refit myself and as comfortable as it was before, now it feels unnaturally good.  Here is my before and after:

Previous:
4 5/16 x 4 3/8, MF - 3/8 rev, 1/8 left, RF - 3/8 rev, 5/8 right, thumb 0 any direction

New: 4 1/4 x 4 5/16, MF 5/8 rev, 3/8 left, RF - 5/8 rev, 3/8 right, thumb 1/8 fwd, 1/16 left. 

Now my hand sits on the ball even better, it's in a lot better position.  Extremely comfortable.  Like Rico has said to me, feel is everything. 

Feeling things that were going on with my grip was the main issue.  The angles of the fingers were allowing my thumb socket to slide forward and out of position, which was caused by trying to "dig in" because I didn't have enough reverse in my fingers to allow them to comfortably sit in the holes.  To keep my thumb socket in the correct position, it was forcing my fingernails against the back sides of the holes or was taking a stronger grip to keep the pads of my fingers on the front sides of the holes.  However, when I was doing that, like I said it was forcing my thumb socket up and out of position which tended to make me start squeezing when my hand started getting tired, which was partly because I could feel that my thumb being at 0 was still too much "reverse" if you get what I mean.  This also told me my span was too long.  Sometimes it takes a while for your hand to rebound from a bad fit, and although my last fit was great and what I needed at the time, my hand has apparently "recovered" to the point where I'm ready for the next step. 

I will be drilling my first two balls tonight with the new fit.  Being that I've been paying REALLY close attention to fit for a while now, I've been fiddling around with mine for the last couple months but didn't really feel the need to change it until recently when I was cleaning my game up and got to the point where it was evident that my hand/fit was where the major issue was at the moment.  These are also some very subtle adjustments to dial it in, so I don't expect any real changes in roll, just improvements in accuracy, comfort, and stamina. 

I DID drill my new fit into a junk ball to test it out and compare it to my old fit, however.  It's really hard to tell on a fitting ball, so something I also do for customers is to drill the fit into an old junk ball, of which I keep several laying around for that purpose specifically.  I had figured out the very specific failures or issues with my current fit, and it actually took drilling the new fit a couple times with an adjustment here or there to get it just right.  I wanted to make sure I was holding the ball right or trying to hold it right before I made a change though.  Sometimes people will come in and swear something is wrong with their fit when they're simply gripping it or holding it wrong, and I wanted to make absolutely certain I was doing it correctly before I made any changes.  I'll bowl league with them for the first time tomorrow night, so I'll see what happens, but I'm already doing pretty good the way it is, I expect to just be better. 

ITZPS,

YOur grip?  What about your hand? what about your roll? that led to you deciding you needed to change?

At this time, have you actually rolled and scored over multiple sets and seen improvements in score or roll that pleased you

Regards,

Luckylefty

I changed my pitches about 8 years ago.  I was having a problem getting a smooth release with less hitting/grabbing at the bottom.  With a fairly long 4 3/4, 4 7/8  span
I had long used a traditional 1/4 reverse in my thumb and 1/4 tuck on my fingers.  After reading what some good tour guys were doing with reverse finger pitches I opted to go 1/4 forward on the thumb and 1/4 away on the fingers.  I was immediately able to get a more comfortable feeling of the ball in my palm, and accelerate at the bottom, without the grabbing. 

One interesting thing to note is that by making the changes I did, I did not change the pitch relationship between the thumb and fingers.  It changes the focus of the weight as it lays in my palm, shifting the weight more toward the pads. 

I get the feeling that lucky lefty is questioning the legitimacy of ITZPS's post...am I wrong?

I get inquisitive...it's 'tone'...

Toners going to tone.

So I'm curious an 1/8" wouldn't matter? or have an effect?

When I did an 1/8 " away on both fingers from 0 it was a noticeable feel difference. It relieved stress on the fingers and relaxed my hand. Not sure how it was and wasn't the answer.