How did I end up on Rage Vortex: While looking for some higher DPS builds, I came across Mathil's Rage Vortex from last league, where in his video he notes it had some of the most insane single target DPS he has played with. If I could take that DPS and add just enough defense without crippling the build, I think it would work. In reviewing his POB, I realized I could drop enough DPS on the gear to get positive chaos resist and either Melding or Spell Suppression. After tinkering more, I realized Melding was giving up too much where Spell Suppression was giving up just enough to still be competitive. I also realized his POBs didnt take into account that every exerted rage vortex would deal double damage through the entire storm, so the build really did have ludicrous damage.
Rage Vortex Final Form:
Level 95 POB when I started bossing: https://pastebin.com/ca0QxkHc . 29M DPS. This POB assumes each vortex is exerted (which it usually is) and does not have flasks active. If you don't think its really 29M dps or that any of the settings in POB are "fake damage", I completed Uber Eater in 1 minute 30 seconds. Ultimately this felt like sufficient damage to complete the fights quickly enough to avoid extra phases.
Map Clear 2/10 - It really is that bad. I hated mapping on this build. I ended up leveling 70-90 through delve as launching the vortex down a hallway was pretty nice, and then finished 90-95 through rotas.
Bossing 8/10 overall, 10/10 based on budget - I'm sure there are better bossers out there (skeles, Fang, etc), but at a 40ex price, I think this is top tier. Feel free to read my reply to this post talking about each Uber and how it went, but overall it was great.