You should not even be required to trim the FD except perhaps for the smallest cog (11T or 12T depending on what you have there) when riding the small ring. A position you normal would not use due to excessive cross-chaining.
On the biggest (physical) cog and the small platter you can have mild chainrub when the bike is on the stand, once you're riding it you'll tension the chain enough so no chainrub occurs.
The FD should be set so it changes from the small to big ring and vice versa in three clicks without (obviously) throwing the chain over the big ring or dropping it off the small ring when doing so.
If you're chain does not descend properly from the taller to the smaller cogs (this is more obvious on the bigger ring) it often means one or two things (or both) : the derrie cable is tensioned too much or there is excessive drag from the cable somewhere down the line.
Before you start fiddling with a gruppo set up always make sure to check the frame/hanger is properly aligned. Without it there is no way to set things up correctly. Be that for the Athena or any other groupset for that matter.
Why not download and follow Campa's instructions? They're well written and to the point.
Compliments on the choice of frame and gruppo BTW. They look classy. Keep it that way....