Get rid of ground attacks period. Sephiroth should always be in the air.
Well, he could have one or two ground attacks for a just in case scenario, black materia is pretty much useless though.
but back on topic, ill amend what i said.you can use BM if you have a very very very very very very very very very very unusual, build that involves you having your feet on the ground. but for the most part, your going to be in the air so its kinda useless. the only reason id even advise keeping scintilla( ground) and transience is cuz sometimes you might get knocked to the ground and need them to counter. but if you dont think so drop them too.
Ok I'm starting to see a lot more sephiroth players with damage builds. Any particular reason why?
Still, gimping your ex gain or depletion in general doesn't seem like a smart idea to me.