FWIW, I also experienced fairly severe buffeting when I first bought my R3T. Know what solved the problem?
A better helmet!
No kidding, my old leather halfie was the main reason the wind caused me so much grief. Maybe it was too large or too wide, but whatever the reason, it sure caught the wind!
I now have a taller screen with a vent, but sometime use the shorter summer screen, or none at all.
But I think it was the helmet that made the difference.
Them's my dos centavos!