Join Date: May 2008
Location: Eastern Seaboard
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Did you ever check the original wheel/tire combination for bent wheel, or tires with thrown belt / out of round? Ever since I found I had 3 (!) bent wheels on a shakey car I owned, have been skeptical about tire guys paying attention, or doing any checking for bent wheels.
Since changing wheel/tire combination made things better, but still imperfect, it may be that original wheels very bent / bad belts, and replacement wheels/tires, not-as-bent/bad, but still wonky.
Put on lift, place solid stable pointer close to tire rim, spin tire, see/hear results; ditto for each tire.
? Caked mud somewhere ?; ever steam clean the undercarriage?
No offense to your obviously trusted mechanic, but, sounds like you need a fresh set of eyes looking at your vehicle.
Best of luck !