What causes the back of the T panel to bow up and snag the louvers? Its been that way since I owned the car for 12 years and now I have new louvers installed and I have the louvers adjusted slightly upward to prevent from snagging. I know how to remove the T panel and done it on another car but what causes it to bow upwards? I do have the back 3 screws tighten down pretty good but she doesn't want to move down anymore? So I figured I'd ask.