I took my new versys 3 days ago, i come from a second hand 17 years old very very noisy honda slr 650, i only needed one ride of 150km to feel headache with the wind and noise hitting my helmet in the versys.
If i was below the wind flow, behind the windshield all was quiet, then if i raised my head well over natural position, i could feel the wind fast and smooth, but riding in normal position, i was receiving a turbulence of wind buffeting like when you are in car with the window a bit open.
So i tried all the positions of the windshield with no luck, 2 holes of down, 1 down 1 up, 2 up, but at the end i tried what you see in the image. I used 1 up hole of front, and then let the the windshield stand in the base, that was a like a release, now the wind is not noisy and smooth!.
It seems that the angle of the windshield against the wind is the first culprit of generating the turbulences, so for now i think this will stay like this for some time, because now i'm happy, maybe in the future i put something more stylish.
I like to feel fresh wind in my face, and that also remembers me how fast i'm going, so i will not never need a new higher windshield. I only tested this up to 85kph because i'm in run-in.
I made this post in purpose of maybe helping someone that have felt this problem like me. I'm sure many people will not give a crap about any turbulence but me yes.
PS: I'm not native english speaker, maybe there are some faults, thanks.