Davidk, when I extend my 11" Madstad to its full height, the adjustable portion of the windshield is as close to the same angle of the fixed portion of the windshield as I can make it. The air (and rain) seems to go right over my head. Last weekend I tried pushing the windshield forward slightly (closer to 90 degrees) to see what it would do. I noticed that I could hear and feel a lot more wind. Could it be the angle of your windshield?