If you want to adjust the gap between the grille and the peak you'll need to get an older version.
The 2013 models on have fixed grilles that you can only move forwards and backwards.
As far as being bulky goes ive never found it an issue and I've got one of the larger old style grilles.
Also in answer to which one to pick. The ultimate debut is the entry level model, while the ultimate Classic is their flagship helmet (when it has the titanium grille)
The debut is cheaper so naturally has a more basic shell construction and a powder coated grille, while the classic is a higher quality carbon fibre shell and stainless steel or titanium grille. Both will do the job they're designed to do, it depend's what you actually want from your lid.