I noticed there are only two small passives in this tree that buff your poison dmg and one of them is tied into pet health or pet survivability. The two big main passives feel like they're built for melee classes too only.

Speaking of pets; they are quite underwhelming except for the big tanky guy while the others all die extremely quickly and do little to no dmg.

I find the one big passive, where you give up force shield/HP for -20% dmg to pets is hardly worth it as well, same with the smaller nodes that do the same. It's way too much toughness given up for mediocre pets.

TL-DR; A little more poison options (esp for ranged) and better pet passives.