[help needed] assassin ST CoC Essence drain build

Hello,

I'm planning to come back to the game in junuary and i'd like to play it with my "own build", but I need some help.

Here is the build idea :


Core :

Main skill :
- Spectral throw + CoC + Essence drain + GMP
I have 2 free socket and after some information gathering I think the best should be "increased critical strike chance" and "void manipulation".

That build is dealing mainly chaos damage so :
- Wither + spell totem + cast speed

The build deal many hit so despair would be a good addition. I can see some way to cast it.
- Blasphemy
- The veiled mod "trigger socketed gem when you use a skill" (but I bet it's costly)
- Curse on hit, but with what ?


Movement :
Whirling blade + faster attack + fortify


I need many crit chance so :
- Ascendency : assassin.
- Diamound Flask

Chaos dammage :
- Atziri's promise




And that's more or less what I would like to do.
Now I have tried to implement this.
Here are the choices I have make and that I'm absolutely not sure about.

With this build my main stat for dammage should be : critical strike chances, attack speed, chaos dammage, projectile dammage, spell dammage

- defense life + evasion (acrobatics + phase acrobatics).
- I choose to go dagger for the "critical strikes poison enemy" node "adder touch" and the possibility to get many crit chances from dagger, but i'm not sure it's the best idea.
- Tree : www.poeurl.com/ccPC
- dual wielding or Lycosidae ?
- Command of the pit

End

So I'd like any input for this build. Better tree. Unique item that I may have forget. False good idea that I may have taken. etc