The lower profile larger wheel diameter tires...17+ makes the car much more sensitive to 'rutting' in the roads....I noticed that right from the git go...but down here in Florida it was a PIA, and every twitch of the wheel is magnified 16-1 on account of the box, anything even remotely loose there or elsewhere will show up like a muvva....the tall old narrow tires for 8" rims, 60 series are not nearly so sensitive, and certainly there even yet improvements over old bias ply junk these chassis were designed for in the late 50's....
you may try less caster, but I thought that was supposed to improve that tracking, not mess it up.....can't remember from the comments which a way it works anymore....
I just remember the very distinct performance handling and hi speed stability improvment in tracking when doing the rack in 01-02 winter....
I had my neighbor stand there just last week, turning the wheel in the garage with no assist....the rack is still in there stable...ain't no slop in that thing what so ever....
I also think there is inherent slop in that control valve, due to it's placement, too much subject to road feedback....the later Jeep boxes, and racks are much closer to 12-1 ratio, so less turns on the wheel, and then less sensitive on wheels feedback to the steering wheel....this is IMO....
got nothing to go on but my personal observations.....I did the rack for quicker steering not even thinking of the wander/rutting issue....but it cured that too....
:beer: