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just dedicate more "bits" to the background to lessen banding ...
I find --aq-strength between 1.1 and 1.3 beneficial to reduce dark banding and blocking (and to counteract the MB-tree affect) ...
I also find --no-dct-decimate to also preserve a little more dark detail ...
However, if you are not constrained for filesize than the absolute best way is reducing CRF (I find I have to go as low as CRF 16 with the above mentioned features on some 720p footage to reduce banding and dark blocking) ...
7ek
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