Front suspension suggestions for better tracking

Also I would not even consider mods of any kind, not even strut rods, until you have fully ruled out
cracked members flexing
Anything loose, including steering box, and ESPECIALLY play in the idler, pitman, and box, and any other ball joint or tie end. Check ball joints and bushings. The procedure in the service manual is fairly good, go to MyMopar if you don't have one. You must get the weight ON the bottom arm to check the lower joints.

So far as the washers, I've seen hubs "eat" pockets that allow bearing cup slop. Unless it is some wrong combo of parts or damage such as that you should NEVER need such a thing. Check the bearings carefully (cones) for fit on the spindle, check for play in the cups in the hubs. Only "mod" I could think would cause that is if the internal bore of the hub got damage and someone turned it deeper trying to fix it. That would completely change the hub/ wheel offset on the spindle, no matter how little. Keep a juandiced eye at it