I too have been playing around with no grips. I have found that you have more flexibility (as far as making ovals in the fingers) than with using grips. Because I had fairly "wide" fingers, I was forced to use 3/4" and 23/32" finger grips. The were big on the top and bottom, but just right on the width. Now without using grips, I drill 11/16" and 21/32" fingers... then oval the sides. Fit is much better. I have noticed some soreness in the tips of my fingers, but I'm sure once I get some callus built up, there will be no problems. Another this I noticed was that after a couple games, any swelling (even a little) in the fingers causes the holes to become extremely tight... something to watch out for. But all in all, I like the feel. I probably lose a little revs, but it actually feels more "solid" to me. Overall I would say just personal preference more than anything.
s^2
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One advantage of bowling over golf is that you never lose a bowling ball
Don Carter