Vibration would have nothing to do with your steering angles. the issue is basically bump steer, ideally you want your tie rod and drag link to be as parallel as possible or on a linked suspension, your track bar and drag link should be parallel.
you can put 15 steering stabilizers on there, still not going to solve the bump steer issue.
I had a CJ that was SOA and was a driver for me (non-trail rig) with stock leaves, no trac bar, no sway bar, bad shocks, no stabilizer and stock steering.. it wasn't all that bad.
If you have a vibration issue, it is something other than your steering. IMHO steering stabilizers are just a waste of money, they hide other issues that could be a safety problem. if it were me, I would just flip the steering to the top of the knuckle if it's not in the way or contacts the spring, replace your TRE and ball joints and make sure yout unit bearings are in good shape. if all that is done, and assuming your caster is with in specs, you should be fine after a allignment.