To those of you with this issue, what brand and model of tires are on your cars?
I'm wondering if it is a quirk of the tire itself. What's interesting is that this steering wheel wiggle isn't something the OP feels, just sees when driving hands off the wheel. Plus it is only at a specific speed. Balancing and changing tires doesn't help so there is no "defect" with the car per se. And not every F30 owner is experiencing this.
So to my analysis the steering wheel is communicating what the tires are seeing on the pavement (in other circumstances a good thing). Maybe the common element is tire brand/model. Determining that should help the OP seek a reasonable resolution from BMW - replace brand x with brand y tires.
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