I've had the same problem lately, and am finally starting to come out of it. What works for me, is to start your approach with everything angles to the right. Make sure to push the ball away to the right, but keep your left leg square to the line, not your shoulders. This will immediately push the ball right off your hand. Take time to practice and see how much you need to be angled, but stick with it because it might take some time. Also, let the ball roll off your hand freely, and STOP GRABBING IT. This is the most common flaw in bowlers, and the top reason why the ball is left of target. Work on waiting for the ball at the bottom, and rolling it off your hands and lifting with only your fingers. When you get the natural rotation on the ball, this will help to feed it right.
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*Erie Community College bowling*
Buffalo bowlers are the best all around in the country.
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MoRich 4ever!!!! If you don't have one, try one. You won't be disappointed!!!