I asked what your requirements were because I didn't have any metric. I didn't know if it was beating Arena or Challenge dungeons or what.
I remember asking you why you didn't like Ammy before, now that you mention it. I didn't get to reply to that then, so I will now.
This is my current general purpose team. I can get 80 more HP on Da Qiao, assuming I don't use HP latents (I do have 5 on Ammy cause that has mattered in the past)

You're right that most of the time you'll be sitting at 9x with a full heal. That's where Ammy's active comes in, allowing you to swap from the 9x + Heal leader skill to the 16x one.
Ammy is similar to Hero gods in that you will often need to manage your Light orbs.
None of the monsters besides Ammy are bind immune.
I have a mix of rows and prongs, but no double prongs. Rose's +Light orbs actually help quite a bit here, which is why I use her over Mini Rose most of the time.
I can usually spike twice for 6 million apiece, or activate everything for 15 million. (Assuming I don't bungle the combo)
As others have said, if an enemy can't kill you in one hit it can't kill you at all.
You can always throw away your heart orbs for more Light damage, assuming Rose is up.
My team could be improved with tactical use of Raph, Sandy, and Eliza, but all of those take a lot of time investment and I haven't been able to grind that much. I have a hard time maxing a single monster during 10x Descends.
I can always beat up to Challenge 7 and some Challenge 10s. I have a harder time with 8 & 9 than 10. I almost never stone on Challenges.
Chirei convinced me to invest in Leilan, and my Pandoras suddenly are a lot more vesitile, so I will be diversifying, but this group has gotten me through a lot.