"Unkillable" Doom Blast but i still die ( need help )

Hi, as many people, i follow guide to make Pathfinder with Impending Doom.

Build is amazing to play, smooth and clear speed is amazing. But i see many people on youtube who aren't killable at all, tanking every uber boss.

Not like me. I'm still dying on mapping very often, and i can't even do Shaper, which was really easy with any Cyclone build.

I don't know if i made something wrong.
And my DPS is not so high. For mapping it's ok, but for bossing it's totally shitty i think.
I know i still need to improve some items, but it will not make a big difference.
Resistance are capped ( 75/75/80/35 )

Here is my PoB:
https://pobb.in/SUqNOOLApm1f

Help me !

You are misaing a lot of phys dmg taken conversion. Thts why u are dying

this build is kinda squishy. why'd you assume that it's unkillable?

Don't know any build specific things, but some general observations:

Pob shows your Flasks don't have 100% uptime - especially on bosses, in those cases your NOT res capped.

As the other guy said some more phys as elemental would be helpfull.

Why are you running Purity of Lighting and Petrified Blood?
Use Purity of Elements to be Ailment Immune.

Your not Suppression capped, even with the lucky Mastery.

And just FYI your missing 5% Poison Chance...