It has very little to do with revs, ball speed, or the core of the ball. It has to do with the axis tilt and rotation that you generate with your release. If you really want to learn how to hook the ball more, you need to learn to let it hook rather than trying to make it hook. This comes from rolling the ball rather than throwing the ball. You'll need to find a Silver or Gold Level Coach and be open to what he or she tells you. This is harder than it seems as it will require that you let go of beliefs that you've held for many, many years.
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