I'm having exactly the same problem finding the right Crash helmet. Schuberth just don't fit. Tried the Shark Evoline and got an hernia picking it up, great hat but that weight. Bought a caberg Konda (crap). Now looking at the Multitech!
Got a schuberth C3 all day comfortable and fairly quiet now i have got the leaks and the pinlock misting up sorted it not too bad visor still wont stay open one click at 30mph would'nt by another one might try a multitec next time