When I was shopping for a 990 I test rode a used2012 with the full aeroflow setup (adjustable main screen, winglets and lower/side things). No buffeting, shoot I only had my bobber open-face helmet and didn't have much of an issue. Definitely a difference from my 2011 990 R w/her stock screen. I can't say for certain which piece made the biggest difference.
FYI I'm 6'1".