Why doesn’t Joe Kelly dominate?

Joe Kelly, with his 100 mph fastball, looks like he should be an absolutely dominant pitcher, but his actual results this year have been mediocre at best.  At sonsofsamhorn.com, I looked at Kelly so far in 2015, focusing on his fastball.  I think that

Kelly this year seems to be be trapped by his fastballs. If he throws them as hard as he is capable of, they are less likely to turn into hits, but more likely to become walks. If he slows his fastball down, improving his ability to throw strikes, the pitches become much more hittable.

Joe Kelly fastballs: Balls per 100 pitches, sorted by pitch speed

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