Hi I am 6'7" tall I tried a skidmarks screen but I found that noisy then I picked up a givi screen from ebay and that was better but I still needed to were earplugs but the big difference came when at this years TT I went to a stand selling helmets and they offered a head sizing service where they offered to measure your head and find a helmet to suit. The helmet they sold me is to suit my head size and shape I must admit I was very sceptical at first but they assured me.
I have to admit that they were spot on and now no longer use earplugs as it has made so much difference and no problem even at speeds in the 80 to 90mph range.