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If you used a backerboard wouldn't it be OK to have a slight crown to the floor? It's hard to tell from the pic but it seems even though the floor underneath may not be perfectly flat that would be fine because the thickness of the mortar would make up for any curvature. Unless you floor is really bad or the tiles are huge!
If you think the floor is done settling you could consciously put more mortar under the concrete board at the edges to try and raise them up. In any case it sounds like a pain in the butt V! I have a bathroom torn apart now but happily the floor is reasonably flat.
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