John
I am Five/ten and medium build (11n1/2stone) and do all my riding with the standard screen. Yes I have tried the "High" screen (I bought one!) and for me the std screen gave the best results even at very high speeds. I use a Schuberth Concept flip-up helmet.
So if you ever want a "high" screen and are touring near switzerland just contact me and it can be yours for the price of a couple of beers.
Fitting is simple.