13-14 mph is going to cause you problems, esp when the lanes dry out. Seems like today's game requires at least 15-16 mph, maybe because coverstocks these days soak up the oil like sponges.
Maybe try cheating your backswing up a little at a time, by raising your starting position a little at a time. It should take your backswing higher and increase ball speed a little.
Personally, that is the type of change I make in small increments...last time I tried to make a BIG adjustment to my start and backswing my timing got all screwed up, taking even longer to fix.
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