Got Ifrit down:
Rikku - Chain + Enwater BSB + Imperil water USB
Bartz - Water BSB - Awakening - OSB
Ellara - USB - Awakening
Tyro - Godwall USB - Astra USB - Awakening
Tidus - Enwater BSB - Sync - OSB - AOSB
Unequip multicast RMs. Most wipes were a double, triple or quadruple cast pushing phases early or killing too many pillars.
Phase 1 kill the pillars then Chain + Enwater everyone to DPS boss with Bartz casting Awakening next and Tyro casting Leviathan Magicite.
Phase 2 Tyro casts Astra ASAP, refresh Chain the everyone kills a pillar with their Enwater. Ellara/Tyro can use Awakenings here when you are ready. Tidus uses Sync with Tyro using Levithan again with it.
Phase 3 again refresh chain then everyone kills a pillar with their Enwater, I had Tidus use his USB here as double cast under Sync can fuck you up if he kills two pillars or hurts the boss enough to move to the next phase.
As Sync wears off I used OSBs to clear rage then AOSB when I could (I had Bartz AOSB too but he got berzerked a second before using it lol). Rikku used her USB, Tyro used Fabula Mage x2. I've got this far a few times in past weeks so don't know how stable the clear is.
Everyone except Rikku had max Record Board including HP. I didn't realise that Rikku has a unique ability, that ability would be great on this boss xD
If I can clear Ifrit 3 more times and buy Terra and Vivi Glints I can probably take Shiva. Don't think I take Ramuh though.