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Kenny, I don't think he is talking about harshness necessarily, if I understand it correctly he is feeling compounding chassis frequencies between front and rear.
If I am understanding it correctly, the oscillations you mention may be due to possible mismatch of motion ratios front to rear, although it is hard to imagine BMW doing that, no one road surface can be predicted and driver preferences also vary widely. If those oscillations are as bad and annoying as you mention, (guessing here) one possible solution may be changing, up rating, the front spring rates.
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