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Last month, we wrote up a series that volleyed off Mike Fast's work.
Fast got ahold of some batFX data. He didn't mosh vs. angle off the bat as such, but we discovered that many pitchers give up faster and slower BIP's, which is another (better!?) way to measure the same thing.
I mean, if you know that Silva and Batista give up 74-75 mph BIP's on average, versus Harden and Peavy giving up 66-67 mph, that addresses your general question plus some others, don' it?
Just tell me what MPH Jason Vargas gives up off the bat, vs. Doug Fister, and I'll take that over the GB/FB/whatever data any day :- )