RC:

I doubt that the ride height is the problem, it is also weird that I didn't experience this behavior on the X6 35d loaner I had.

My theory: the chassis is very sporty and maybe even too firm but the spring rate is too "soft". I can't explain it too well in English but I think that BMW had to make some compromises and making the spring rate more firm would have had a serious impact on ride comfort.

This is why I actually prefer air suspension systems like the one on the Cayenne.

Another small issue with the brakes: the brake feel is a bit too soft too, I would have preferred a more firm and linear brake feel. 
 

I suppose BMW M GmbH doesn't have enough experience with sporty SUVs yet, this could be an excuse but on the other hand they have the X3, the X5 and the X6 non-M models and they definitely should have learned from them. Weird.

I guess the old saying "you get what you pay for" is still valid. 

 

Seems like you are the first one to complaint about it.

My theory is Piech had someone sabotaged your car, make you feel the BMW is inferior to the Cayenne Turbo.