FWIW, I’m 5’7” with a 30” inseam and wear an Aria XD4. I picked up a 2020 790 Adventure S yesterday. On the ride home, at anything over 60mph, I felt like someone had crammed a couple of vibrators through my ears and into my brain. It was insane. Intense rumble and double vision. I tried every combination of seat and windscreen and had minimum improvement, if any at all . The closest I came to easing it was with a high seat and low screen setup––and that was only because I could sit abnormally upright and crane my neck to escape into the clean air. I stood up a couple times while going 70mph (the buffeting was unbearable) and it was so smooth. Sure, there was a lot of wind on my chest and it would be unsustainable to travel long distance that exposed, but having your brain scrambled by turbulence is far worse. So I ordered the R windscreen. Hoping it will protect my chest while getting my head into the clean stuff. Today, I decided to try the wingledectomy. It worked for me. I only road about 5 miles at speeds between 65-80mph, but the buffeting is gone and noise is at a standard level. It got me thinking... I’m a surfer and filmmaker with 40 years of anecdotal experience pondering the hydrodynamics of surfboards while watching film and video from above and under the water. I tried to take those visuals and imagine the air as water and how it might flow over, under, and around the front end of the bike. I know some people have felt that it’s the mirrors, and I think this could be a part of it. It looks like the winglet might be directing air right at the hand guard. And I imagine that turbulent air would get pushed up to the mirror where it would get further sliced and diced into a vision shattering, headache inducing mess of frantic air. It’s all speculation, and completely uneducated at that. But I concocted this totally hypothetical cockamamie illustration to prove my point.