On the Limited stock I thought the buffeting was drastically improved. Lots of highway miles at 80+ and no issues. I was coming from a Road King which isn't a fair comparison maybe but the Limited was stellar with the buffeting.
I have the 7" LRS with recurve in dark tint and it is worlds better than the stock shield but I still get a bit of buffeting above 70mph. Nothing I can't live with as I normally ride from 9am to 5pm on the weekends. But I think I'm going to order the 11" clear for those multi day trips where we do 2k miles over four days or so.
I had severe buffeting the vent open or closed made no difference I went to a 7" not a big change the air was hitting me in the forehead I moved to a 10" that put the air over my head and my eye level is just above the shield then you could feel the difference open/close the vent. Adding the fork deflector's eliminated that updraft that comes around the tank straight up your torso.