This is for anyone interested. I'm in process of getting both doors working ship-shape, and I learned yesterday that putting washers between the door and the lower bolt of the front window guide rail (the metal piece that the big plastic slider on the window glass holder rides in) does wonders to realign the window. I was having just about every problem possible; window was cocking forward as it rolled up, window would stick on a roller and jolt as it moved up or down, window would just flat out jam in mid-travel, window would be angled way out and miss the chrome door sash completely, the works. By experimenting with different groups of washers placed between that front guide rail and the door sheet metal and then threading in the lower rail bolt, I was able to fix every one of the problems. Tightened up the regulator slop, put the window at the proper angle so it slides cleanly into the chrome sash, and somehow it even leveled out the window almost perfectly so it guides itself perfectly against the seal and seats firmly without the slightest fight. I ended up with three washers total, I'd guess about 3/16" worth of material. Pain in the arse to slide them in place, but it really did the trick. I don't know if this means the old regulator assembly is just old and loose, or if the plastic sliders are worn, or whatever else. Just know it worked, so if you're having problems with the window motion give it a shot.