Hey Jake you already have the answer. Lose end on tracbar. Take that shit back to the zone and get a moog, napa premium, or oem. I can get you a deal on a napa premium .
If you have a buddy with a xj swap his tracbar as a test or go to lkq and get a clean used one for a test. You can return it within thirty days at lkq and buy a new one if it fixis your problem.
I tried a zone tracbar a few yrs ago and it lasted all of 5 weeks.