I clear SS 100% with Ammy/Odin and three auto-heals mixed in out of the six guys. It takes roughly 25-30 minutes each run, so I don't know how "farmable" that is, but it works every time, and when you're desperate for Dub-Myths like me, this is what you do. My team is:
lvl 95 Ammy +41 RCV
lvl 99 Siren (Awakened)
lvl 99 Lakshmi (Awakened)
lvl 99 Hera (Awakened)
lvl 99 Zeus (Awakened)
Odin (Awakened)
You don't need Siren's skill or Lakshmi at all, so use any auto-healers you want. These are just the only ones I have. I guess you could use Lilith as an auto-healer to slightly speed up your progress, and if your Ammy has enough RCV, you might be able to get away with only two auto-heals (I haven't done the math). Zeus's 2% light reduction is actually useful in this case, but isn't necessary. If you can get away with two auto-heals, a Neptune + two gravities would really speed things up.
I'm probably not saying anything new here, but maybe someone will find this useful.
EDIT: I did the math, and if you have a maxed Ammy with 99 RCV eggs and an Odin with auto-heal, you don't need other autos! That would speed things up exponentially. And Ammy is getting a leader skill boost, right? SS should become very simple to clear if you own an Odin or Ammy.