Frostblades Trickster (Vengeant Cascade), pushed as far as i know how. Any ideas?

I really like this build, and crucible added a lot. So I tried to minmax it, and am pretty far. and i am happy about it. I don't think i will be able to make another one like it in the near future, so that's part of my motivation to present this. another one is that I am not entirely happy, because with my eyes on dps while tweaking, I became too vulnerable to ubers. I have killed all ubers, but none deathless. And yes, I do suck, but maybe you can suggest something for this build?

https://pobb.in/AxwtHHvmI3z1

If you want to get max pob damage, you have to put down 3 totems and use frostblink, and use all the flasks. considering that the boss will get hit by the initial hit and the returning projectile, pob suggests 270 m dps. ... But i chose vengeant cascade over panopticon in part because i didnt want to rely on my totems. without those, both melee and returning projectile are around 90m dps each, so i'd say, 180m dps without totems is a realistic value.

as far as improvements go, i have more or less given up on crafting better jewels for the belt, after having lost a lot of currency. I could fracture a better spell suppression roll for my armour, but frankly, i don'T think that my uber-deaths are because of that. poe says my effective life pool is 18k - which simply isn't a lot, even though i tried to keep my life (relatively) high. but life alone isn't enough. i thought about adding armour, but small hits aren't my problem, and i can't get enough armour for larger hits. a cast when damage taken setup might help, but what to sacrifice instead? considering that i don't like to use totems, that might be an option, but... sometimes, totems are nice to have.

so, do you have ideas?