[2.4] EHC Firestorm witch, opinions and advice needed

Hello everyone
Since leveling is such a painful process I've decided to roll my probably last char this league, and since I've never played firestorm- here it is.

I've made this thread mainly to get some answers and ideas.
My idea was to run tricurse in Heretic's Veil (temp chains+enfeeble+warlord's mark) and 60% conversion with double Consuming Dark. Is it possibly viable endgame idea? And by endgame I mean red maps, Atziri and uber lab. Maybe I should focus on oure fire and get Doryani's Catalyst? Also, should I keep it hybrid or maybe get CI?

This is my current hybrid build, how should I modify it if I decide to go CI? Also, which damage nods are truly worth getting?