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Well that's the way to figure if it's a problem with the car and/or wheels and tires or your spacers... if it goes away when you take spacers off then mic them for thickness at a couple places around each, if you find one or more that is not within a few thousandths of flat (hopefully an experienced suspension/wheel tech can chime in and let us know what acceptable runout is) then you've found your problem and yell at the vendor.
Even if they are perfectly flat but are causing vibes that aren't there without them, there's other possibilities as to how a spacer could be made wrong; the lip that centers the wheel may not be perfectly concentric with the bore of the spacer where it slides over your hubs, and/or the lip is undersized and/or the bore is oversized. I don't know that any of these possibilities are that likely, but I'm just throwing out all the potential failure modes so you can check everything.
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