Since it's not the spline lug nuts bottoming out, then maybe it's an out of round wheel? Move them around and see if the vibration moves as well, try front to back and see if the vibration starts coming through the steering wheel. it should not be centering issue, as hub centric wheels only only help center the wheel while installing, they do not center the wheel wheel when torqued down, that's the job of the conical lug nuts.
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