[Rawknees'Turbo]

For at least ten years, my sunroof has done as you describe (the trailing edge does not fully lift), so I just push up on the middle-back portion of it with one hand while operating the switch with the other - always lifts into, and stays in position that way. Since that's worked so well all these years, I've never looked into what is actually preventing it from lifting (although I have adjusted the overall height of the sunroof, as well as making all sides parallel.