Unfortunately, I don't THINK that the match trigger will fit the compact...
USP triggers smoothe up some as they get used. So get some snap caps or range time and have at it.
As for gunsmiths, I've never had my full-size done, but if I did, I'd send it to Jarvis... Why? Only because I hear good things on TFL about it, no personal experience at all.
Hang on, I'm sure you'll be getting lots of good suggestions soon...