Knights of Cygnus Skill Tables

Isaac, what does lightinig charge REALLY do except for giving ' lightining boost to the player ' ?
because im a striker and im confused about the skill build. You see, every skill in 2nd job is pretty much important, and I have to leave 1 skill at 11 or 14 [forgot MaxHP, Knuckle Mastery, Knuckle Booster [ Wind Booster ], Energy Charge corkscrew blow and Blast, and this new skill ' lightining charge '.
So, should I leave lightning charge and max the other skills instead?
or leave blast /corckscrew and max lightning charge instead?

you definitely have to max the charge since its a damage multiplier and will make you ridiculous at lightning weak monsters and more powerful where there is no elemental disadvantage.

just leave booster at 11. it hardly matters. you have enough points to max everything else.

edit: @ below, didnt know. every other class doesnt need 20 booster. i have to argue that leaving energy blast at 11 would be better since 306 - 360% is a lot less drastic than 285 - 420% and you still hit 3 monsters with both. blast is a sometimes thing right? while corkscrew just has a delay? how often can you use blast?