I'm currently a 2nd job into thunder breakers and I'm getting a bit confused on what I should do next to prepare myself for 3rd job.

Right now, I've maxed :
MAX HP INCREASE
CORKSCREW
KNUCKLE MASTERY

and I'm planning to max out: knuckle booster, energy charge, energy blast.

After looking around on the internet, it seems knuckle booster isn't as favoured nor corkscrew blow. I just want some more opinions on this.

Reason why I'm maxing out knuckle booster is for speed infusion on 3rd job, which I heard is a speed buff for the whole party and it stacks with normal boosters. And I guess I like corkscrew blow for it's damage, for now...

I'm starting to think corkscrew would become a bit useless towards 3rd job, due to its charge and such. So should I consider to spend some NX once I get to 3rd job to reset my skills and max out lightning charge instead? Or should I keep the corkscrew blow skillpoints, and just use charge as a replacement for lightning charge?