Qustion about the Deception of Dreeg set

I have a question on how the +poison damage% modifier of Deception of Dreeg interact with the regular damage bonuses(I don’t have the set yet so I can’t test).
When you use DEE does this multiply the damage with that % or do they just get added to the regular damage bonuses?

There is also the issue how a “33% Chance to pass through Enemies to Dreeg’s Evil Eye” works with the modifier that makes the main projectile a AoE.