It is most definitely the air coming over the top. You didn't mention how tall you are, but you probably need a taller screen. None of the Triumph screens work well for riders 6' or more. ClearView just started making a replacement for the TA/SM Roadster Screen in a couple of sizes. Ideally, you should just be able to see over the top. The replacements fit right on the existing mounting brackets. I had the exact problem with the Summer Screen. The air off the top hits me right in the eyes (I'm 6') and shakes my head and helmet badly over 60 mph. The Summer Screen is a different angle than the Roadster Screen and is 13" tall. I'm waiting for ClearView to make a Summer Screen replacement (available shortly I hope) that is at least 17" tall (above the headlight). You can contact them at ClearViewShields.com.
