Arc Ignite Elementalist - looking for feedback

My fellow exiles, well-versed in the art of pob,

I am looking for optimization on my Arc Ignite Elementalist.

Trying to build a decently tanky character for legion farming (no bossing except Hillock), with the 100% more life sextant. It still rocks a cast on death portal.

Here's the pob for a mid-high investment : https://pobb.in/tX2XQvGNC7BF

May your wisdom guide me to improve the build at a similar level of investment, as well as with higher budgets.

Thanks and Cheers

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Main mechanics

Offence

- classic ignite elementalist backbone, with the "twist" of using Elemental Equilibrium (possible with Arc) and Eye of Malice to reduce enemy resistances by a lot.

Defence

- grace, determination, some phys as ele for Phys mitigation

- MoM + Eldritch battery + discipline for EHP

- Saffel's frame + Tempest shield for 75% Spell block

- 79% all res

- 68k ehp, 140k with molten shell (although it is not yet nerfed in POB)

Recovery

- using the flask recover life on use tech with flagellant flasks and 75% increased charges gained, allowing for 5 charges per hit. Question : is 3 flasks enough or should I drop the life flask for another utility one + CB jewel ?

- ES gain on hit from watchers eye

- a little bit of life leech (over estimated in PoB since we're not casting that much)

- a little bit of life regen

Gameplay

- S tier clear with vaal arc + ignite + proliferation + explody flask (not at all required)

- Shield charge around