915D4 benefit???

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By TKellogg

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  1. For the first time I hit my 915D3 8.5 w/Diamana D+ 70 on a trackman launch monitor. I found I have a high launch angle between 15-17* and a spin rate close to 3000rpms. My attack angle is at +5 My question is would I benefit from using the 915D4?

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