Hmm. Didn't notice the self-debuff thing, I'm going to have to re-run everything I guess.

One-run on each element using a moderately-tailored team gets me 10M per, plus 13.5M for Water and Fire (Thunder and Water hime teams) because I've been optimising Thunder and the game throws SSR water himes at me. That's put me top 300. If I can double my burst damage with a 50% debuff engineered the turn before, that should put me safely clear of position 350, which looks to me like the only rewards step that matters (assuming you can't drop out of top 1000 and aren't looking to make top 50, which I expect requires S-level souls at this point)

Thanks for the details Slashey. Good luck trying for that 2 full bursts... :-)