| Optimum launch angle and spin rate are dependant on ball speed.
For a 150mph ball speed, he should be getting 12-13 degree LA and 2600-2700rpm spin rate.
Shaft stiffness depends as much on his loading characteristics as it does swing speed. He could be swinging at 100mph and loading the club really hard.
But I'm no expert either. That's just what I've heard...mostly from hanging around here.
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