You can't rule out a bad tire either. I had a set of out-of-round Kumhos that could never be balanced properly, even on a Hunter 9700 series machine that put the heaviest part of the tire on the lightest part of the rim to minimize vibration.
I battled the same problem you're having for years on my 1997. Buying new rims helped a little, then replacing the bearings and coilovers and control arms helped more and now I have very very little vibration.
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