kromc5, I am 5'7" and have the Madstad and like you I had a real hard time with windshields, mainly because my helmet is soooooo bad, noise-wise among other things.
But like the others have said, the MadStad works. It must be magic or something. I have tried a bunch of settings on it and have found 5 that work very well for me. Today, since it is cooling off, I went to full up and put the top forward about 2" - there is no turbulence on my helmet and I have at more than a hand length (7") before I feel any at 50 mph. I get air flow, but no blasts and no pushes from behind.
If you can, try out some of the adjustable shields. You can buy just the RoboBrackets and mount other shields on it - and I know that Rlathen was able to just buy the CHAD brackets and used another shield. I really think you should be able to test a windshield out. CalSci seems to have a good return policy. The MadStad RoboBracket is also satisfaction guaranteed.
I liked the CalSci, but this performs so much better for me - especially with my :cus: helmet.
I put some pictures of the shield and hardware in my Albums, take a look. I hope you find what you are looking for - to me, the windshield, seat and handlebars are the most important mods you can do for comfort and safety.
Tom