Sounds to me that once you drop it a few times, you start thinking about hanging on to it, and probably squeeze and hang on too long. I'd definitely have your span/grip checked - and I wouldn't hesitate to have a different person than who drilled the ball do it. If it's not the grip/span, then I'd say you're having some serious timing issues. Take a couple weeks off, and when you lace them up again, forget about it and just do what's comfortable and JTTFB! Good luck, I know it'll be tough as aggravating as this is.
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9~"Fastest Chicken in the South!"