Very interesting. After dry firing the 320 FS with the Robert Burke trigger, I was convinced it would be a great shooter. Very disappointed relative to my expectation -- not in the trigger but how it cycled. And, I was equally surprised, in the other direction, by how well the 320 Compact shot relative to the FS, and a Glock 17. Between your observation, and other things said, I think my experience with the Compact vs the FS was not an anomaly.
GT, I learned something from you. Two of my three, have the #2 trigger, and all appear to have the same takedown lever, which I am assuming is the old one.
Initially, I was pretty nonplussed by the modularity of the 320. Now I think it is a darn good feature -- both in the ability to switch modules as a field expedient repair and to configure the exact upper and lower you want. I am toying with the idea of getting a Carry, so I can have the FS grip I prefer for shooting, and the C slide which seems to cycle better.