I personally have switched back over to gripless. For me, gripless gives a more solid feel in the fingers as compared to grips (then again, I used the squishy ones). I think I get a little more revs w/out grips, but its close. AS far as fit, I have found that I need to drill my fingers just a touch larger than normal becasue after a couple games, they tend to get tight. I would suggest taking an "old" ball that you might not throw much any more and having it refit going gripless. Throw it a while, see how it feels and go from there. Worst case, you don't like it and are out $25 or so...
S^2
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The perfect qb/receiver combo in Miami:
Ginn & Juice
(Ted Ginn Jr and Cleo Lemon)