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I had a similar issue and was baffled. It turned out my tires was out of balance on the road force balance scale. It was reading over 45-60lbs! The issue was the bead on the tire was not fully seated. It looked visually seated from normal check but when the 2nd tire shop (the one I should've gone to in the first place) inspected it, saw it was slightly off. After reseating the tire and road force balancing, it dropped to 15lbs and under for each wheel.
After that, 15 to 20mm spacers didn't even make any vibrations at all. Prior to this, spacers would cause the vibrations but no spacers would have no vibrations.
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