From my limited experience, those symptoms don't sound like a sway bar problem. One of my sway bar endlinks was sheared off and the other one was junk, and the only symptom I had was a clunk when I went over uneven ground or turned a certain way. Plus, if you had all that other steering and suspension work done they probably would have seen a bad endlink while they were under there. I could be wrong, but I doubt it'* the sway bar. Bad news is I don't know enough about it to point you in any other direction! We'll see if a gearhead pops in here.
1997 SE w/SLE package
"White curse? I think it'* more like.... WHITE FURY!" - MyLittleBlackBird