from the glass I have installed over the years I remember having the same issue until I figured out that the rubber holds the glass in front of the pinch weld, not inline with the pinch weld.
lots of lube-I've tried everything from dish soap to tire mounting lube-use something water soluable-never tried KY....haha, a small rope in the rubber to assist pulling the lip over the pinch weld, tape around the area to prevent scratches, a good helper who isn't overzealous and lots of patience. if it is getting to you then walk away and come back later
have you checked the assembly manual for their way of installing showing the drawings etc?
there is a screwdriver looking tool that helps. it is a screwdriver with an angle bent into the end of it and a small ball on the very end. the ball fits into the rubber to assist with the rubber getting over the pinch weld.
https://www.crlaurence.com/All-Produ...%20set%20glass.
https://www.gtglass.com/products/pig...-rubber-gasket
https://www.gtglass.com/products/sel...-tool-ball-end
https://www.kimbridge.ca/products/ru...l-end-10-255mm