If you are trying to avoid buffeting, you made the right choice with the Madstad. The stocker was brutal, and the VStream S/T screen was better but there was still enough for me to go for something else. If I was a few inches shorter it would have probably been a different story. I spoke with Blair at Madstad for a while and explained my concerns. He said I'd probably be fine with either the 20" or the 22" being that they have a good amount of adjustability in both angle and height. I am not a fan of really tall windshields so I wanted to get the shortest one that would do the job so I went for the 20". Right away I could tell that it works, they designed the mount to let enough air underneath of it to alleviate the negative pressure that causes the buffeting.
The Corbin is higher than the stock seat by probably 3/4" or so, about the same as the stock seat in the high position. I have the Yamaha windshield mount set at the middle setting, only because I feel it seems more solid than the high one (Madstad instructions say to set it at the high position). You cannot set it at the low position, the Madstad mounting brace plate will hit the front panel. If you look at the picture, you can see that I currently have the mount set tilted about 3/4 of the way forward and around 1" from the lowest setting. I haven't finished messing with it though. At that setting, the air hits me just below the top of my helmet - not loud or booming at all but you can hear a little bit of wind noise which I don't mind at all. In fact, I have a Powerbronze shorty for the summer and I much prefer the full clean air to the booming noise of the stock or VStream in the dirty air.
I imagine if I got the 22" it would be even quieter but I am fine with the 20". I'm sure I could get it even quieter if I raised it up more so I'm not concerned. I'm sure you'll be very happy with the 22", let me know how it works for you.