you had bumpsteer because you lowered the TB mount BUT didn't use a DPA.The Rubicon Express Trac bar For 4”-6” lift I had required a drop bracket. I had to drill two holes in the frame for the bracket and drill the trac bar mount. I had bump steer with the track bar. After I installed the currie it was a world of a difference.
I would not buy RE parts. Go with JKS or MC if you can’t buy Currie. You won’t regret it.
RE express is not “Extreme duty” . Just hollow tubing.