4th update: https://pobb.in/EmwRM4A8UdWD
FS: https://pobb.in/aNWNUN4Sc7xG
Please read notes - it contains my entire insights and thoughts from playing the league, from lvl1 to 40/40.
Up to 16.3mil Firestorm dps with Anger+Empower swap, Vaal will hit even harder.
the eHP is a little low since I did not tweak any of my snapshot gear for chaos resistances, and we lost res from tree. It also doesn't account for 3k regen/second to ES+Life, which is a huge defensive layer with Corrupted Soul (MoM keystone corrupt).
What we LOST: chaos res, Cover in Ashes mastery, a good life node, 200 health from Vitality reservation
Gained: Arcane surge buff, Life nodes, high damage Fire mastery, Vaal firestorm boss-swap, prismatic burst aoe
Enjoy - this skill is never played, and the new vaal rejuv totem/Vaal Firestorm will enable you to take it to new heights.
EDIT: Gonna give full credit to /u/EasterIslandHeadass for the build suggestions and putting me on the right track when I started this in 3.20. I merely built upon what I thought was best for smoothness and QoL.
Crucible update: With 100% bigger RM bounces, we can remove Pinpoint and use a stronger gem. Bigger bounces means more shotgunning on bosses. With slower proj+increased aoe, I'm guessing we can get 4 bounces per cast for 4x the pob dps.
Firestorm crucible node is just a straight buff, no changes needed.