Usually, the lefthand levers control the front derailleur and everyone has to trim the front derailleur at one time or another if you have a triple. It is just making minor adjustments to keep the derailleur from rubbing the chain when the chain line is at an angle.

Campy has infinite teeny adjustments while Shimano has the "half shift" clicking and is therefore limited to how much it can be trimmed. Having used Campy or barcons for years but just recently learned Shimano road STI shifting I can definitely state that Shimano has more of a learning curve. I'm with Emily on this one.

If you're having to "trim" the rear derailleur, it is out of adjustment.