Jamas, You can pull the front part of rubber gasket up and out of the way enough without removing the glass window. Maybe try this before more epoxy.
"phines" originally posted the fix, but now that thread seems to be lost to history as it won't come up in search.
My SBC brackets are on, but it was still binding a bit (slow coming up), as soon as the front glass edge hit the area of the forward window track about 5" down from the top of door panel.
I used different types of adjustable wrenches, etc to just grap the side and widen the track a bit. I found long needle nose pliers were the only thing I could get down (or up) inside the door frame to reach that part of metal track. I twisted pliers to widen the metal. The more I widened it, the faster the window went up and eliminated the binding.
Then used pure silicon spray to lube rubber track.
Now both windows are perfect! YAH!!!!
Hope this helps!