On my F800GS, I have concluded now for my set-up it is the mirrors that is causing me the bother.
It is more a noise problem than buffetting my head around.
Tall Isotta screen and bigger Vario-Screen on top of it work well at pushing the air over my head and also sideways.
But by waving my hands around I can feel the air coming back in to hit the sides of helmet.
I fitted mirror risers which help in making me see better, but not much help with the noise.
I could have rotated the mirrors out more, but i did not want them much wider than the bars.
I will try riding with no mirrors sometime and see if i can prove it is really coming from them.
It is more a noise problem than buffetting my head around.
Tall Isotta screen and bigger Vario-Screen on top of it work well at pushing the air over my head and also sideways.
But by waving my hands around I can feel the air coming back in to hit the sides of helmet.
I fitted mirror risers which help in making me see better, but not much help with the noise.
I could have rotated the mirrors out more, but i did not want them much wider than the bars.
I will try riding with no mirrors sometime and see if i can prove it is really coming from them.