I struggled a bit with those too.
Had to rearrange my teams to prioritize single target nukers being protected over anyone else.
A Barrier girl is absolutely indispensable in this fight as she negates one of those insta killing attacks.
Then its just praying to RnJesus that all your girls activate their Ultimates.
I didnt want to do that, but I had to finish leveling up girls that I was keeping around L50+- as I was leveling them with Ampys only. Those extra stat point for hitting L80 did a lot. Plus I had to go crazy, hunting for Crit buffing Equipment in the Whale shop, and Leveling that up as well.
Had to run the maps several times until the RnG hit and all the girls activated as necessary.
*I wish I had known that the 55x gacha for a Rainbow was a one time thing and will not become a regular reoccurring thing. Had I known that Cowslip would be super useful in these two maps for her Barrier skill shielding one more team. If I had a Barrier on the 2 strongest crit teams instead of just the main kill squad, this would have been made oh so much easier. I do regret not doing that gacha a lot, but there was no indication thats its gonna be a one off the way it has been implemented.
*Funny thing - Azalea 6*, was the tiny WiP of those fights. From her team she always survived as the last one. Always activated her ult despite her Skill lvl being still 1 (not enough Skill Blooms) and that Ult always crit and most of the times did just enough to push the Boss fight from 1st phase to the 2nd one. I was very impresed by the cute little Magician being so stubbornly dedicated to her task
*Plus I could see just how big the gap is between rainbows who have above 40 Evade, to some like Iono who have only 40. Anything below 50 Isnt worth it.