Helmets are a crap shoot. What's good for one person might not be for another. I've bought many helmets (10+) looking for greener pastures but have come to the realization that the grass isn't always greener.
My advise is to just keep plugging away until you find something that works well enough. Also, be aware that something as trivial as windshield shape, position or height has a dramatic effect on noise, air flow and turbulence. I have several helmets that work well with naked bikes that are simply too loud and turbulent when used with a windshield.
Right now I'm back and forth between my Scorpion EXO 700 and a Bell RS-1 w/SolFX transition shield.