I know it is about a 911SC, But the windshield keeps coming out Options

[worn]

I know there are other places to ask, but I feel like I know you folks. Also, I have tried and they tell me "you're doing it wrong" Okaaaay. But I followed the directions that are supposed to be doing it right.

I have a 1980 911SC with the rubber windshield trim. I got the trim and seal from Pelican and a new windshield from Stoddard. I used the cord method to install the glass and got all of the rubber around the pinch weld. However the rubber doesn't fill out the lower corners on the outside. There have always been gaps on each lower corner. I bought a book about 911s before purchase and it lists this as a design flaw. It wasn't a great book, but I think the corner issue is a common problem.
Now the rubber has worked back out and over the pinch weld at the lower left corner and I can see that the glass is thinking of jumping ship. I may be able to recover the rubber lip back over the metal, but I only have a few miles on the new glass.

Help?! Emoji for member down on his knees with tufts of hair in each fist.
Warren