On the subject of buffeting I've been playing around with my screen for a while and this works well for me. No buffeting at all and I can ride with my modular helmet open all day up to and above legal speeds. On a days ride I may get 1 or 2 small bugs on my sunglasses but that is about it. I am just on 6ft, 184cms and I ended up raising the screen 45mm and pushed it forward at the bottom by 25mm. I can still look over the screen rather than through it. The bigger gap at the bottom lets in more air which may be part of the solution. Pushing it forward 25mm means the winglets are up against the indicators, it's not a problem but I might change the indicators for some smaller LED ones. I was using a laminar lip before but that is no longer required.