I'm currently running a mixed team
Mordred
Titania lvl 70
Gaia lvl 77
Hades lvl 71
Amon(U) lvl 80
Raiko lvl 70
Ryu-Oh lvl 55
I managed to get quite lucky with all my jewel draws, at least 1 SSR per...
Maybe if I was as lucky with weapons, I might have been able to grind Ragnarok