Searing Touch / EE / Eldritch Battery / Fire Crit Build - Need Advice

Had an idea for a build using this staff:

The plan is to use Fireball w/ LMP, Firestorm w/ Increased Crit, and two curses: Elemental Weakness / Flammability.

Spell totem + spark for EE activation, and a plethora of auras.

Was wondering if someone could look through my skill tree and point out any flaws or anything I might need to add: