Ok, from my junkyard experiences:
The motors are interchangeable. I took the motor out of a trooper and swapped into our regulator.
You can get an entire new assembly from isuzuparts for 100 bucks shipped to your door in <5 days.
I did the tab upgrade from Tim. Worked awesome on driver's side, until my cable broke and eh on the passenger side. Better than it was, but even with the glass moved as far back as I can get it, still wants to rock forward if I roll all the way down. The plastic guide on the center rail is just too worn.
Consensus, the plastic guide on the center rail is the problem, as well as the fact that the center rail curve does not match the curve the window must travel, poor engineering.