i haven't had that problem either,but if I'm really cracking on 100+ i shut the visor because of the noise.i use the vents also, the one on the top works great,can't remember if the chin vent is any use as if it's warm i usually open the visor slightly too
Probably just due to the aerodynamics on my bike, sat upright and the air flow off of my flyscreen. Had a look last night, can't see any adjustment, just the first click on the visor is quiet high and no ability to just open a smidge. Don't fancy cutting the visor pins ratchet pins just yet, but maybe a solution, we'll see.
