PoE Temporal Chains, dorfcally builds

I thought i was fairly capped for endgame content but I can't do past Wave 20 simul, uber atziri (oneshot by every ability...), ubers, Feared, and die once in a while in juiced t16s. Did a 80% deli but 100% is out of reach. Oneshot every 5 seconds in rank500 tota (lucky I'm finished with all tota challenges for the league). Any advice on where to go from here with 40~ divs? Original plan was Forbidden Rite but MBs are too expensive this league. Could I finish 40/40 with a BV, poison SRS, or similar? Doom is great fun and all but it can't do the content I enjoy d