Mana Stacking Mind of the Council Doryani's Touch Ignite Elementalist

Hi guys,

Looking for advice on my sort of meme build for 3.22, I have specific questions listed after the build description.

https://pastebin.com/n9Adatye

Main concept is stacking mana and using Mind of the Council + Lucky Lightning from Voice of the Storm + Shaper of Flames/Storms + Manastorm triggered by Arcane Cloak for lots of flat lightning dmg big ignites and max shock. There's a bit of set up for max DPS and I may forgo Frenzy entirely if it feels too iffy (had sockets to spare), but you hit once and refresh it with Flammability for as long as you need with the Defiled Forces notable. If the starts align I can realistically hit once and do 50ishM Ignite DPs over around 4 seconds.

The big questions:

• I'm relying ENTIRELY on a single flask to cap all my elemental res. I have no problem manually maintaining the uptime myself just want to know if it's even slightly viable? (Lasts just over 10 secs with 5 uses before empty, and 100% charge recovery from mastery + 75% from Overflowing Chalice.) I think it could be alright but haven't tried it before. Flasks aside from mana/bismuth seem pretty flexible.
• I heard a while ago that if you get 50% of your damage to hit mana before life that elemental ailments against you have less efficacy and are not guaranteed on crits against you. Does anyone know if that is true? I think I can forgo DPS and get ailment help on flasks/pantheon if necessary if this doesn't work like I hope it does.
• Does Berek's Respite feel alright earlier on? I imagine in very dense maps it works well but if it is only in dense maps that it shines then I won't use it until late game.
• Just general advice/warnings would be rad, thanks!

Also I'm aware of the low speed in general of the build, I don't mind. :)

Thanks!