After bashing my head against the wall trying to brute force Herra with Mav and trying (heavy emphasis on trying) to learn one of the Mavuika combos, I just gave up. I tried quite a bit of teams on Herra, which led to me having to re-clear Gecko, so I moved my Varesa team to Herra and just cleared Papilla again, but with Chasca. I had to finally crown Iansan burst after already spending so many resources to crown Mav burst and strongbox/level some more artifacts for Mav so her and Chasca didn't share artifacts. And even then, my Varesa team struggles with Durin, so I decided to try Crescent Pike Xiangling (C1 btw) instead. Took a couple attempts, but finally it's done. I despise this boss so much; It and the abyss dog and his cringe chickens are by far my least favorite bosses.
Also yes, I do have skill issue. I am aware. I absolutely suck at playing Mavuika.