The Neriak wine quest should fix your banking woes? If not just stand outside and pan the camera around while in bankable range.
The upper floors of CoM arent bad at 54, maybe a bit scary at first. Also The Hole is usually quiet if you fancy a trip in there, just be careful not to die in an awkward spot
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Other thoughts:-
SolB
Lower Guk (not sure how many more levels you can do in there)
KC if you want to group and know how to do grouping as a necro (most are happy if you charm a pet for dps)
Also get your Howling Stones key if you havent already, that's necro paradise.