window problems

[camshaftgsxr]

ive taken my window regulators and glass out of my doors and replaced the old regulators (less than a year old) that were bent and jammed all to hell.

ive put the new ones in and the window is still stiffer than it should be, but i still have a problem

when i roll my window up to the top its stiff, but goes all the way just fine, i can roll it back down and it works, then i go back up and its fine yet again, but on the second time down like clockwork it jumps off track and jams i have the door back together correctly but i dont know if all the hardware and the door are straight (as in not damaged or bent) what should i start looking at? the regulators are brand new but we have a parts truck here at the shop so should i grab the oem regulator off of it to see if it works?

i would really rather fix the problem im having instead of swapping another regulator and hoping it works.

ps this is the third regulator in the door since i bought it.