My main suggestion to elemental ninjutsu would be to shorten the casting time for San spells down to 1.00 seconds (from 2.50) It's silly when the Ni spells result in a higher DoT than the San spells because of this (not to mention making casting them somewhat impractical and wasteful anyways because you lose out on so much katana DoT.) I'm content with the damage they do although most of the gear that improves it is kind of hard to come by.