So I tried Hera-Ur again for the first time in a couple months. I didn't win and blew 2 stones trying, but it can be done.
Team is pretty much as I'd had it before, only a little stronger(with the potential to get a little stronger STILL, if I ult Homura, along with leveling everyone except Sonia):
Red Sky Fruit, Strawberry Dragon
Phoenix Knight Homura
Gigas
Crimson Lotus Mistress, Echidna
Extant Red Dragon Caller, Sonia
(Pesco!Ares)
Total HP is a bit over 54,000. I managed to make it TO the boss battle, and got Ur over halfway down...Sadly, I only had 14k HP when she switched to using High Kick, which does over 18k so I died. By that point I'd already burned a stone on Minerva and one on Ur herself, so was out of chances. Still...it's possible. Had Ares' and Sonia's actives ready for if I'd made it to my next turn and everything.