Also I find the brakes to be less effective than the ultegras too. I have set them up properly (I assure you I know what i'm doing here), and the single pivot rear brake wasn't central when I received the bike and moved from side to side when fettled by hand. It also doesn't have as much grunt as the the twin pivot ultegra version either.
Campag's view is that the rear brake can be too strong if dual-pivot and lead to wheel lockup so they introduced single-pivot rear which is lighter and allows more rim clearance. However a year or two back they reintroduced a dual-pivot rear option for people who feel more comfortable with that and clearly some do.
FWIW I have Mavic dual-pivot front and rear with Swissstop green pads on my otherwise Campag best bike and I love those brakes. On my wet weather bike I have Campag dual-pivot front and single-pivot rear with Koolstop Salmon and I get on fine with that too. Pad choice does have a bearing.