Binthere
CLIM is a right b1tch, and proof someone screwed up somewhere. The only way around it, I'm afraid, is very careful load planning to ensure your lateral imbalance is as close to zero as possible - any lateral imbalance will directly influence max. taxi weight and thus payload.
Once you've gotten your head around that one, you'll encounter the wonders of vertical CG limits. Alternatively, do as we did and pretend you never read that part of the Boeing manual!
The 767 freighter, especially the converted ones, are very close to being labelled as useless pieces of uselessness. IMHO, of course.