Just happened to come across your post while surfing the forum. You say you were 3/8 forward and now you are 1/2 reverse. This makes me curious - what is your span? This makes me wonder if you aren't squeezing the ball. If you can't clear the thumb hole with out it being larger than you normally call for, you might be knuckling the ball. It just sounds like something might be wrong with your grip.
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LIFE IS TUFF, BUT IT'S TUFF TO BE STUPID!
Competition is great, but the competition within one's own mind is greater.