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I can answer that question in about 2 weeks!
It is entirely possible that the control loop for the electric steering has some oscillation at a particular vibrational frequency that may only happen with certain wheel / tire / road combinations.
Remember that video posted where Johny Lieberman praised BMW for going back to hydraulic steering on the f30, that it was much better than the electric steering on the e90? Maybe BMW listed to him and got so confused they couldn't solve this problem.
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