Study of the support gems for Poison

I'm still learning of poison mechanism, confused most time, so here is a topic:

well first there are some skills we all used for Pathfinder poison build:

1. PoisonBurst Arrow, main hand skill for clearing.
2. Gas Arrow, for aoe mass killing like Ritual-in-map or Delirium-endgame, also poison source for Toxic Growth.
3. Toxic Growth, for huge damage to kill Boss.
4. Vine Arrow, for slowing enemies, not vey much used.
5. Herald of Plague, for spreading the poison damage from PoisonBurst Arrow.

And here are some support gems I want to talk about:

1. PoisonIII, no need for the skills above IMO unless you play Bleed for the same time.

2. Deadly PoisonII, only need for PoisonBurst Arrow because of the poison damage to spread by HoP, I've seen lots BD using it on Gas Arrow and Toxic Growth, well for Gas it could add some damage but I would put other support gems for mechanism, and for Toxic Growth I think no need because we only need huge explosion damage.

3. Bursting Plague, no need because we have poison burst already and it's making more damage.

4. Tacati's Ire, only good for PoisonBusrt Arrow for faster poison DoT.

5. Arakaali's Lust, good for PoisonBurst Arrow for clearing or Toxic Groth for bossing.

6. Corrosion and Uul-Netol's Embrace are good for armour breaking BD.

7. Admixture and BleedIII for bleeding BD.

well that's all I can think of.

Tacati's Ire is pretty busted with eternal rage 100 spirit but well worth it.
I have a permanent 51 rage for 51% more attack damage and 102% faster poison damage.

Crosbow user with gas grenade but would work with gas arrow.
Persistent Ground III - because fire is annoying and it's a poison build.
Encroaching Ground - Because size does matter in this case. Screen wide clear.
Deadly poison II -Such a big buff and I only use the 1 poison source.
Tacati's Ire - Combined with Eternal Rage this boost the damage from (21.9k to 66.8k) all the way up to (66.9k to 203.9k)
Corrosion - I need the armour break and I don't have Embrace.

I'm combining that with High velocity rounds for the riven armour effect against fully broken armour to get additive physical damage which while unscalable it is still multiplied by my poison magnitude. Mostly just for the boss and some elite that I have to get close too.

I can stack 4 poisons at once and a the gas cloud from a single grenade covers the entire screen after 5 seconds. The detonation delay does take some getting used too.