I agree with you. I really think it is a engine mount or something to do with how the engine is firing. I never really thought it was anything drivetrain related as the transmission is amazing. It makes me un easy that after nearly 2 months and visits from BMW engineers and multiple relapcment of parts they still have no idea the cause.
I will let you know if I hear back today as they are supposed to be doing another "roadtest" at the request of a factory engineer...
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