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I would say even though it happens on both wheelsets, to check road force numbers.
I had vibration issues above 100km/H with 15mm spacers and brand new BBS GT4/Michelin PS4S wheels. I didn't have the vibrations with the factory 219M wheels but when I put the 15mm spacers one, the vibration existed as well. I sure as hell thought it was the spacers so I tried an 18, and 12. That didn't help at all. Ultimately I asked another shop to road force my GT4s. Turns out the bead was not 100% seated (visually it looked it was) and they were able to get road force numbers down from 45lbs to 11lbs. I no longer have vibration issues with the GT4s with 15 and even 18mm spacers. I do not know if I have vibration issues with the factory 219M and spacers as I did not road force balance those wheels.
I'm not saying this is the cause of your vibrations but road forcing the wheelset will definitely rule it out if the numbers are low enough.
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