I am 191 cm long and have a 2012 GS standard. I bought the Givi Airflow 330 but suffered from head shakling too much in every position. Then I installed the Nippy Norman winglets which clearly decreased the shaking but not 100 %. Lately I have left the upper part of the Givi home. I only use the lower part in its most backward position plus the winglets: No buffeting, no head shaking. The wind is turbulent and clean and the wind noise is easily suppressed by ear plugs. This kombination is ugly as hell but so am I. Of course the wind protection of the head and shoulders is not perfect. On very cold weather I add the upper part of the Givi.
The Touratech rectangular spoiler on the 2" taller Winderlich screen still caused noise on top of my helmet. Even bigger issue was rain on visor and misting up.
I also get the same issue on the Givi but it's still considerably better than the plain screen styles. But then I'm only 5' 8"
Noise is a given. If not wind it's engine and other traffic. I'm sure helmets could do a lot more to reduce noise but then riders want through flow ventilation.
Yet again when can we have electronic active noise suppression in crash helmets?

I still have an MRA spoiler. It was crap on their Diversion 900 flip screen but marginally better when I chopped off the flip.
I've never tried it on the Beemer. Drilling the screen was a step too far.