Sorry didn't see this till now. First off did you center up the front axle like we talked about?
You don,t have DW so it's probably not a track bar issue but double check it anyway.The mounts need to be tightened with the weight of the vehicle on them.By tighten I mean TIGHTEN
Double check the jamb nut,mine came loose at least once after the install. Have your boy get in there and turn the wheel(engine off) ,crawl under there and check for play in EVERYTHING. I was really pleased with the rusty's kit ride and handling until I added those damn 3/4"
spacers. That's when things turned to crap for me. Rides like a 3/4 ton truck now so that's why I'm switching to a long arm setup. To be honest with your miles I really suspect a bad new shock. If they're Rusty's shocks they don't have a good rep to begin with. Mine didn't even make a year. Me,I'd try swapping sides with the front shocks and see if the issue moves with the shock. Hope ya get it sorted out without too much hassle.