Check to see if your track-bar axle side mounting hole is elongated. It will look more oval than round. That would indicate some room for play in the axle. If it is elongated then you might need to patch on a new mounting plate with a hole drilled to spec. You can minimized play in the track bar (axle movement side to side) by regularly checking the torque. I don't remember off hand for a TJ, but on a JK it's around 115 ft-lbs.
2013 JKU Rubi, Minor Mods: Sheldon
1974 CJ-6, 1-tons, 40's, 401 V-8, TH400, and lots of stuff: Panthro
is it just the front or the rear too? Sounds crazy, but when I changed up the steering in front I got massive what I found to be called "wander steer"...the rear was all over the place. Come to find out, tightening up everything up front showed how bad the rear track bar bushings, control arm mount bushings, sway bar bushings were. Doesn't sound like thats the case..but just food for thought, I had to go through and replace all the bushings in back. Made it MUCH better.
when it breaks, fix it, and try try again
When my front end gets a bit loose I just tighten the crap out of my trac bar. I know you're supposed to torque to 110 lbs, but I tighten it all I can and it fixes it. Aftermarket case hardened bolts are a good idea as well. JK's come with all-threaded bolts, not good at all.
Try changing tire pressure too.