I am just a bit taller than you with a bit more inseam. I have the gel seat which is taller and waaayyy more comfortable (650). I tried a million different stock windshield positions, extra washers, the works. Bought a Givi windscreen. It helped, but not perfect.
When the Madstad came out I had the WTF reaction and bought it. Went with his recommended "stock setting" with the standard screen. Love it! 80 mph +, faceshield open, no buffetting worth mentioning. When the weather cooled down, I didn't bother going back to the Givi because I can change the height and angle at a stop light enough to cover my neck from direct wind. It ain't that pretty, but who cares? It works and I'm too busy looking for crazy cellphone using cagers to look at the bracket.