My plastic rear window, (which i installed a few months ago) is causing turbulence at highway speeds, this translates to some pretty bad vibrations throughout the car, and could lead to instability. Im fairly sure it is the window which causes these vibration, because:

1. I can see it vibrating like a mofo
2. The vibration of the window is exactly the same frequency and timing as felt though the rest of the car.
3. It isnt there with the top down.

Im wondering if this happens to anyone else? And what to do about it?

WIll the roof tension adjustment help the window issue? BTW i didnt install the patch which goes over the zipper, ill do it soon but im not sure if it will help.