Interested in advice on optimizing mana build

Hey all,

First time posting here. I have a mana-based build in Standard that I've been tweaking with here and there throughout leagues.

Started with Manabond but been playing around with Archmage support and other skill gems to see if it can get better and seem to like Ball Lightning. This is by far my best build I've made myself probably no doubt due to Standard having a glut of currency from leagues.

Anyways, I am interested in really pushing it to the next level with the respec I'll have in the next league. I am open to completely redoing anything if necessary but would like to stick with a mana-based build.

Any general comments you have, suggestions of skill gems to best use the mana or anything else, any mistakes you see I'm making, go wild!

For your information I have around 1.4k chaos, 30 exalted, and 30 divine. So I have some currency to play with.

Here is my PoB link for everything currently:

Thank you in advance!