I have pearls and hybrids now don't own any solids as with the low speed not a good mix. I'm close to the line and use a five step delivery. I had a 14 lbs ball drilled up it raised the ball speed about .25 mph lol. I've tried the less hand thing one of the things I'm doing now about .25 to half mph difference. I've also went from lofting the ball more to a more up the back of the ball release with less loft doesn't really change anything there. The arm swing height maybe a factor I don't have a high back swing but a lot of other players with adequate ball speed don't either and anytime I've tried to mess with that my game just goes down the tube. I agree there must be a reason and it's probably several factors but I would think if the typical male my size can generate 15 mph ball speed for mine to be 11 mph something should be glaringly wrong shouldn't it?
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