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Got a machinist friend that can check them for runout? (easiest way I can think of is with a dial indicator and magnetic base, with the wheel removed)
If you could determine that there is more than an acceptable amount of axial runout on the spacers that definitely could be your problem.
Did you also have a look at the backsides of the wheels when you mounted the spacers? that is, is it possible that some corrosion or debris could have transferred from the hub to the wheel when you removed the wheel to install the spacers?
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