Try some of those drills. Try getting into a delivery position at the foul line and swing the ball with a relaxed hand a few times without letting it go. Then on the third or fourth swing forward just let the ball go. Do it several times. If you're successful allowing the ball to roll rather than you throwing it, move to a one step drill.
Something that might help is to use some Vise HADA tape on the back of your thumb to allow your thumb not to stick to the backside of the thumb hole and slide out easily.
How's that for starters?
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