I just increased my ball speed from like 12 to 15 or 16 today. I dont know if this applies to you, but I found that the higher your backswing, to get more speed, the harder you turn your hand at the end naturally. This works for me,dont know if it will help you at all.
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15 years and still going strong! 15 years old that is!
DA DA DAAAAAA!! UP UP AND AWAY! TO THE BAT CAVE ROBIN!