Prolly ought to move this discussion out to it's own thread rather than burying it in the intro thread.
Two other things to consider about bump steer:
1. The panhard rod on the rear locates the rear axle. If that's off then it could be the rear suspension causing the bump steer. Look at your rear tires. Do they both line up with the fender the same. Some members have noted a couple of inch shift of the rear axle to the left when they added a lift. Calmini actually included a panhard rod drop bracket with their lift kit for that reason.
2. Ldub had a thread about his waggly rear end. Basically some of his rear suspension mounting holes in the frame had 'egged out' (worn to oval shape). That caused his rear suspension to be loose and allowed for wander as he was driving.