Ok, I don't normally reply to newbs, because they typically disappear, before you even get a chance to post a reply. You've been here for awhile, and that's cool. This is just IMHO. Here you go....
1. You have a loose power steering belt??? Tighten it up!!!
2. Who put the bahl(sp) joints in, and were they put in properly? There is a specific installation procedure, and it involves having the correct tool, to properly torque down the upper bahl(sp) joint camber/caster sleeve. Each side should be checked to make sure it doesn't bind, with the tie rods disconnected. This HAS TO be done.
Bahl(sp) joint sleeve.....
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3. You've had 2 toe set alignments. That tells you absolutely nothing. Go find a better alignment shop. One that can change the sleeve (if needed), to bump your caster up. Caster has the most effect on getting your steering wheel to return to center. (Other than flat tires, or a box screw that is cranked down too tight.). Ok guys, and the other **** too- JB weld in the stearing(sp) column....
Start looking there, and let us know how it goes. BTW- how about an alignment printout, that includes everything. Thrust angle, Camber, Caster. Your front spindle setbacks would be good to see too. Again, go find a GOOD alignment shop, with some 50+ year old dude, that understands this ****. Stay away from the young "techs". Except for
@1987 GMC Jimmy . I think you would be safe with him.....
EDIT: AGAIN, I had to purposely misspell things to get rid of the damn eButt links....