Had my 328i also with (non-adaptive) sport suspension. But had also addional K&R sport springs installed (lowered by 30 mm) and also had the OEM 18" 397 wheels with ContinentalSportContact tires replaced by Kelleners Sport/Hamburg 19" wheels with Pirelli PZero RFT tires. With neither the OEM suspension nor the new K&R springs + 19" wheels I have problems like these. However with the 19"wheels on some roads I feel a very light vibration in the steering wheel, probably due to the (bracking)tracks on the road. But it is not really bothering me ánd I was warned for it in advance. So to my humble opinion it has nothing to do with the tires.
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