One thing I would say is that the stock 3.0 Q5 suspension is a marvel of shock absorbing and comfort. The SQ5 is definitely harsher, and the SQ5 20/21 inch wheels are more of a problem than solution for you by adding even more harshness. When people say how great their after market suspensions are they generally are referring to handling ability, and most of these tuned units would have no problem shaking a big camera right off the roof!
The tradeoff for that comfy ride is a bit of body roll, brake dive and squat, a general feeling of mushiness at times. I think the Eurocode sways might solve a lot of these issues without introducing too much nastiness on a stock suspension. This would be my starting point.
If you can find the adaptive suspension on the 3.0 Q5, even better (not an option on the SQ5). Then you can soften it up off road or firm it up on the track.
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