I've finally started to run my fun double Summer Kuro setups. Any ones I show are viable looping setups with no RNG. I'm starting with one of the worst refunding servants in the game Black Grail looping, and the Quick looper with some of the highest damage potential in the game. If there's any servants anyone wants me to use in the setups let me know and I'll use them if I have them.
Astolfo: (NP5, needs double bond CE)
Caren: (NP2, Single enemy within niche)