[2.4] Optimizing my elementalist arc build

Hey, everyone!

I am currently rolling a crit arc elementalist in ESC and was hoping for some input to optimize my build: https://www.pathofexile.com/account/view-profile/Megaf0rce/characters
The character in question is LightningChaingun.
The build utilizes a CoH-Orb of Storms-Warlords/assassins Mark setup for leech and charge generation.
I run a purity of lightning, lightning coil and Paragon of Calamity for damage mitigation and to not oneshot myself to ele reflect. (the cwdt setup in my lightning coil is neither optimal nor final)
Because rolling 6 blue sockets on a lightning coil is rather unlikely, i chose to put my arc setup (Arc-inc crit chance-inc crit dmg-faster casting-lightning pen) in a pledge of hands.
For auras i run HoT and Wrath, so i got myself a helmet with 15% reduced mana reservation from wrath.

That should summ it up pretty well.

I would really appreciate if you took a look into my build and gave me some input on what to do better!