This windshield thing drives me crazy! I am 6'2", but mostly leg, so probably equivalent to 5'10". I have tried the laminar lip, some improvement, laminar lip with ears, more improvement and finally the Cee Baily 22. All some improvement in the noise area, but the buffetting continues.
Saturday, I put the stock shield back on, couldn't remember where I had stuffed the Laminar Lip, but did find the "ears", so I put them back on. Went for a ride. Whoaaaaa baby, whats this? No buffeting! Clean air for a change.
Couldn't believe it so Sunday I did a 300 miler. The most enjoyable ride in 5K I have had on this beast. Apparently the ears keep the air from collapsing back in and buffeting the lower part of the helmet, and without the Laminar Lip, the air is hitting me just at the low part of the helmet, but clean. Go figure.
You might try this, as everyone is different when it comes to shields, but with the hot weather on it's way her in New Mexico, I think I am on to something.