I believe a lot of people have reporter the Clearview screen or the Windvest in a much larger size over the stock Roadster screen has good improvement in regards to buffeting.
Me, i don't have that problem with the stock screen but I'm 3 inches shorter than you and my helmet has anti-buffeting ridges.
I have the tall Clearview to replace the stock Roadster screen. I'm 6'1" and it will go low enough to see over or high enough to see thru, and took care of the buffeting.
I have the tall Clearview to replace the stock Roadster screen. I'm 6'1" and it will go low enough to see over or high enough to see thru, and took care of the buffeting.