Higher death rate? No wonder you are dying so much.

Dude you are doing it wrong man...REALLY REALLY WRONG.
1st of all, Life Steal only gains 20% effect in Inferno. 2.9% x 0.2=0.58%

2nd thing, Life on Hit does procs off from multiple mobs but it is limited by its co-efficient depending on the skill. But the nett gain is waaay waayy higher than Inferno Life Steal. (Lazy to explain the maths here, google yourself)

3rd thing, You are technically standing in melee range most of the time, WHERE THE HELL IS THE "BLUR" PASSIVE?!

4th thing, Since you are standing in melee range for nova most of the time, expect to face a lot of dmg from molten/plagued/desecration etc. Force Armor DOES NOT save you from any of this damage since this dmg is done per tick.
It is PRISMATIC ARMOR you are looking for.

5th thing, ASTRAL PRESENCE? Really? You are already having close to infinite AP from crits from Energy Twister and Chain Reaction explosive blast. Having Astral Presence is redundant.

6th thing, As i mentioned earlier, this is essentially a tank build. (Since you are standing close range). You need more than 150-250 resist to survive. 500 is bare minimum.

1 thing i need to add about this build is knowing which skills trigger casting animation and global cooldown,
That split second can mean life and death for this build.
Don't simply spam Frost Nova as you like. (especially when you are moving around or mobs are moving around, making critical mass hard to proc off from twister) Wait for mid attack animation and interrupt attacks.