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That in 2008-09, in few AB's, he has had better results against the fastball.  Worth considering.
For the whole career, though, he's .3 runs worse than average per 100 pitches on the FB, and -1.7 worse than average on the cut fastball.   That's -1.0 runs per 100 pitches for the two combined, and 100 pitches is about 7 innings. 
Roughly comparable to a 65-70 OPS+ on the fastball and cutter combined.
Slider and curve, he's only -0.1 runs per 100 pitches lifetime... about a 96-98 OPS+.
vs. change, he's -0.76 runs per 100, about 1 run a game, suggesting that yeah he is being overmatched by the FB, cheating, and then swinging through the cambios.
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The power/finesse thing is not conclusive, but it's suggestive, and the career pitch data doesn't help Langerhans' case IMHO.
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Personally will be watching the slider-speed bat issue on Langerhans, to see for me ownself...