Uneven LCAs help

Yes, the LCA bushing bolts (spindles) need to be finally tightenened AFTER the ride height is set. If you tighten them during anytime before, the rubber will be twisted in the bushings, producing an artificial spring torque, and then the bushings will slip or the rubber will tear and the ride height wil change as that artificial spring torque is lost.

It kinda sounds like one of the T bars is clocked off 1/6th of a turn relative to the other. The LCA's should be hanging down at a pretty steep angle when inserting the T-bars. The passenger side LCA seems to be the issue (it sounds much weaker than the driver's side, per your opening post description, and the driver's side is therfore taking almost all of the front end's load) and the passenger side LCA may not have been hanging down at a steep enough angle when the T-bar on that side was inserted.

Edit to add: And on the question of locking down the LCA bushings after the ride height is set, this is a known procedure that is common to all such LCA arm designs where the bushing is locked in, both for double, unequal length control arm types and McPherson strut types. I have seen it not documented in other factory car manuals like on certain Opel, Toyota, and Mitsubishi models, so am not surprised that it is not in Mopar manuals either.