I have compacts on two of my bikes - one is Campy Centaur, one is Campy Record, though I doubt there's any difference with Chorus. I don't have to trim all of the time, but depending where my chain is on my rear cassette, I do have to adjust. But, that's usually if I'm on one of the bigger cogs in the back. I do not trim every time.

Oh - do you have a compact-specific front derailleur? I do on my Record bike, do NOT on my Centaur bike. That being said, I don't notice that I have to trim more with one or the other.