@ luv2andy, have you tried your screen on the lowest setting?
It is my opinion that the buffeting & noise is caused by the big flat screen moving a lot of air & causing a low pressure area behind it. The shifted air has to go somewhere & the low pressure area behind the screen is the place it goes, the problem is your head is in the way & the 'dirty air' hits your helmet, causing the buffeting & noise.
With a lower screen the shifted air is less & lower, hopefully below your head, so any any coming around the screen hits your body, not your head.
It is a help if you can get air, other than the 'dirty stuff' into that low pressure area & that is what the Givi Airflow does & some of these other mods, like pushing the screen away with spacers etc.
On my 650 I had an Airflow fitted, it worked great, Aprilia/diamond style mirrors on extensions made it better, but when I got the 800 I thought I'd save my money & try a few other things before buying the Airflow.
I put the screen on the lowest setting, fitted spacers to push it out, longer ones at the bottom to slope it slightly & it wasn't too bad, but not good enough. I then bought one of these
https://www.ebay.co.uk/itm/376206542364, cheap enough to try it & if it didn't work, throw it away. It worked! I fitted it overlapping the OEM screen (not sticking out above it) and I am looking well over the top of it.
It's good at all legal speeds & some others too.