Here is the best drill I have found to fix release issues.
Stand at the line as if you were already posted on the shot, slide foot in front, trail leg behind you pointed away from your target and balance arm out. Let the ball dangle at your side and look down at your hand. Now move your hand to the position you want to be as the ball gets to that flat spot at the bottom of swing. Once you get there push the ball forward about a foot and a half and then relax. Continue to watch your release point and watch your hand as it stays in that position. Do this for about 30 shots and then try a full approach. If your release is still a little off, go back up to the line and do it again.
I have done this drill every day for the last 3 weeks and my rev rate has increased, accuracy of my tilt and axis of rotation has increased, and my overall release has cleaned up. This drill is a great way to get your mind to feel what you are trying to accomplish, and you can see the hand at release so you have a positive feedback that you were in the right spot.
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