I agree with larryn , it appears a problem with your car vs a systemic issue. Question is what exactly is the problem.
I also agree with darge82 That you may want to request a BMW Engineer, escalate the issue with BMW.
I doubt this is a issue, more of a dealership doesn't know what the issue is and how to fix it. I wouldn't have regret on the suspension bro. BMW will fix it, its just the right people need to get involved.
You will have your track car back.
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