Buffeting seems to be a common problem. Several of us have had a bit of reduction by installing
Memphis Shades Lowers, part number MEM9891. Curiously enough, it seems a lot of air comes from below the screen and the lowers help. A quick indicator is to ride at the speed that causes the most buffet and put your left forearm across your chest (sounds a little weird, but it works for some of us). This would give an idea whether lowers would help or not.
If not, you may have to go with a screen that allows for adjustment (sorely lacking with the Triumph screen mount).
