I copied this set-up except for using Temptation Key on Opus, 2 Harmonia over 2 Efes (I only have 1 Efes), and using a basic Symmetria over Mk2 and I'm gettting a consistent 6m-6m45s clears. I totally forgot that the second Triple Zero call can clear debuffs. By Turn 6 I'm already past 50%HP so I have no issues dispelling at this point.
i dont think theres decent enough character to replace illnott with this setup. she is provide double dispel delay reset after ougi, veil and multihit after normal atk. maybe you can try using grea, zoey, or other character with dispel, but ur dmg output will decreased by alot.
Setting up the correct skills and weapons for it to auto activate on 50%. Basiclally pray that the auto activation window lines up perfectly with 50% or just a but after that but not BEFORE 50% or you’re toast