I use 1Z Einszett Rubber Care Stick “Gummi Pflege” on mine.
http://www.autogeek.net/1z-einszett-...are-stick.html
I didn't have the seal catching problem to begin with, so I can't say that the Gummi Pflege fixes trhe problem or even keeps it from developing, but definitely worth a try.
What I 've heard about tint on windows, is that it's actually more slippery than glass. I'm also tinted.