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OP said the issue was corrected by MS swapping out a set of spacers, but we never got to see what the issue was.
Considering all the leg work the OP did to try and fix the problem, I would bet with 99% certainty that the spacers were machined incorrectly.
I have a set of spacers that "appear" to be identical to the MS ones (I'm sure many are made by the same manufacturer) and I had a slight vibration as well at speed. After measuring the CB of the spacer it measured to about 72.40 mm and not the 72.56 that the BMW CB is. Now this is such a small variance but would exacerbate at speed causing a shimmy.
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