29 Tudor rear window install dilemma

[fred93]

So I am installing a new rear window glass in a 29 Tudor. I have cut the new rubber gasket and super glued it together, then installed it around the new glass. I trial fitted the glass into the rear window opening and it seemed to fit okay. I then put the inside window frame in place and started to screw it down. I installed several screws (but not all of them) and only snugged them down a little bit. I then went outside and looked at how everything was lining up. I noticed that the bottom corners were not tight against the body but the center area was tight against the body. I took some pictures but they don't show the gap too well.

I am reluctant to tighten the inside frame too much, afraid that the glass will shatter (it is tempered glass).

I know that the rear window will leak like a sieve if I don't somehow caulk or seal that area.

So where do I go from here?????