The NCX's are a great sail, i had a fare bit of time on them last season..

Havn't sailed one as yet but what i have herd and seen is that the MOJO has come about to give Severne a true bump n jump sail, they rig really full to give them the deep down grunt as well as a tighter leech to get you going in the lighter stuff, also designed to be stable and lofty in jumps and built in a stronger construction than the NCX, and the average weight sailor should be able to run a smaller than conventional sail.. e.g 7.0m instead of a 7.5m, but not sure about the power output so that was just to give you an idea.

They run a increased luff curve to give the fuller shape and to allow for less battens to reduce sail weight and swing weight through the top of the sail to give it a lighter feel.

The 5.3m would be fun in some flatish water with decent chop to launch off..