I went through exactly what you are experiencing, Steve. I had
Z28Canuck and
Fuelie help out too and it took a great many hours to do the front and the rear.
The rear finally came out near perfect. The front I gave up on in order to leave for CruiseFest last year. It's certainly not perfect.
To get even close, I'm going to remove it all, remove the windshield, and install a new clips and a new weatherstrip.
I already used new stuff the first time, but now I'm going to get them from different suppliers. According to
THIS thread, only two places have the good trim clips.
HERE's a thread on the proper front glass sealing compound.
I remember a thread about the proper front weatherstrip. I think it was available from CorvetteRubber.com but I haven't found the thread yet.
Good luck.