PoE Blub-take builds

Hexblast non crit version I need some help or Advice for my homebrew Hexblast build. What kind of jewels should i aim for ? What i can do better ? When all the gems are on max level then i get 5 mio damage per hit. The next skill point will get in the Chaos mastery for increased wither effekt. Its kind of a work in progress :D But so far i'm quite impressed, tankiness is somewhat way better than expected. Thanks to all the curses and less damage dealt. Thanks in advance