I know a LOT has been posted on this. I have a 6th Gen and have been plagued by wind buffeting since new. I recently added the Vario Touring screen..... limited help - the best setting was with the shield all the way flat.
So I removed the screen entirely and tried it - WHAT A DIFFERENCE!!!! Smooth, quiet air stream (I could even ride without ear plugs!!).
Next step is to cut down the stock screen. Given how smooth it ran with no screen at all, its not clear I could cut it too much.... maybe just offering the instruments a little protection.
And put my brand new Vario up for sale (dang... $150 down the tube on that one)
Really surprising to me just how severe the wind buffeting really is with the stock screen, essentially ruining the enjoyment of riding. The aftermarket screen very marginal improvement.
Anyone considering trying a new screen - TRY IT WITHOUT A SCREEN FIRST! Might save you the expense of iteration.