[ Buffeting was acceptable with the Ultra and unacceptable for my head with the SG.
I re-read your post and am convinced it's all about the windshield. Ultra's have a lot taller shield than SGs...Instead of cutting down the SG shield go taller. If you want, Clearview and other recurve shields will let you go about 2" shorter than a non-recurve and get equivalent wind protection. I'm only 5'9" and the stock shield was awful, a 4" Clearview recurve better, and I ordered 6.5" recurve just before the snow arrived (and stayed), so I can't give you a ride report yet.
At 6'2", I'm betting you would be happiest with the tallest recurve you could see over. And, as long as you leave the protective film on it, Clearview will let you return/exchange if you're not happy.
I do use the front fork baffle and adjustable fairing wind deflectors others have mentioned and recommend them.
I do still think the new RXQ from Arai would help out too...