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I have that screen on the DR350. Granted my speeds are lower on it, but it was used fast a bunch of times over winter on road tyres. The trick was to get it as vertical as possible, so the lip at the top forces the turbulence somewhere other that on your visor. Also, you may benefit from increasing the distance between the bike and the screen. An air gap will allow a micro-current of air to reduce the significant change between air pressures where the buffeting happens.
pdlouche-
You might see it on photo, but have some tortec bike pannier stays holding the windscreen a variable distance away. So that clear screen (the best of at least 6 I've tried) is meant to mount direct to the black plastic. At that distance it literally makes bike impossible to ride above 35 to 40mph.
Can move it around quite a lot, gets near vertical, supported at the base by some screws linked by some old fuel hose, allows adjustment in angle but doesn't flop about.
Up till last year had some abs plastic wing lets that I just riveted on down the side in that cutaway bit above indicator. Between all that makes it really well protected upto 55mph, with good view at ground. Keeps the worst of winter and wind off. But above 55 is just a pita.
BrickMan
Back in business. Rides best it ever has been, rear swing arm bearings been on the way out for donkies, makes a huge difference to confidence, though actual handling still the same! It's a bit low in the ass as still has original shock, tried a longer body shock to raise it, but raised too far, felt amazing on tracks, but the rest of the time was a total pita. Braking into corners you get actively jacked forward.
Just in time for the really good weather. Screen coming off it, fed up of buffeting problems, nothing really makes it go away