All 4 fights beaten! Ok, the first GIlgamesh fight doesn't really count, it's just there for a formality.
I Mage Meta'd all 3. Here's what I used for each!
Ifrit EX:
Terra: R4 Waterja, R4 Magic Breakdown, Devotion
Edea: R2 Darkzone, R3 Memento Mori, Ace Striker
Lulu: R3 Meteor, R4 Blizzaja, Mako's Might
Yuna: R2 shellga, R5 Curaja, Knight's Charge
Tyro: R3 Full Break, R3 Mental Breakdown, Dr. Mog's Teachings
RW: Divine Guardian
Normally, Terra uses R5 Firaja w/ the Fire Armlet, but just in case he resisted Fire (despite FF14 Ifrit not doing so), and this fight takes 60 Stamina, didn't want to take chances, so went safe. Edea replaces Kuja thanks to her new toy, and yeah, you can pretty much see how things are here, and my team's manliness goes up by 1 despite it now being a legitimate Tyro's Harem. Everything else is straight forward otherwise. Lulu uses Blizzaja thanks to the FF9 Ice Staff making it the strongest spell she can use if you're wondering (despite the slightly lower magic), and Meteor is there to hit the nail.
Fight went by smoothly; the only thing of note is I realize Edea might want Darkzone R3, so I craft that after this, having the resources to do so.
Titan EX: Basically the same set up as above, only Terra goes back to R5 Firaja. Also notable that in this fight and the previous, Tyro and Yuna were equipped with elemental resistance. Didn't seem to make much of a difference since survivability was not an issue.
...except in one instance where I didn't kill the Heart and took like 5k damage when my mitigation was down outside of Tyro/Yuna who resisted it. I mean, make no mistake, that's an S/L either way, but still, OW! Anyway, the tough thing here is that my buffs would wear down as the heart would come up, and I'd waste precious time reapplying them. So I needed to basically get it that the heart appears after Edea uses Inargual Parade, and Lulu uses her 2nd Focus. Terra will also have a full gauge, so I want to make the most of that. At first I try using Memento Mori a few turns by Edea instead of jumping into Dark Zone but even then he took a little too much damage, so instead, I say screw it, and have Edea dick around her first two turns poking Titan for negligible damage to build gauge. Also Lulu opens with Meteors in the first phase, since it does slightly less than Blizzaja (no 20% boost) but gets slightly more gauge.
Turns out that was all I needed; with that, the 3 girls could just fire like mad, Yuna would use the 2nd RW during this phase because Titan's damage is honestly not scary at all, and once the heart dies, I cruise.
Gilgamesh: I'll just note the meaningful changes here:
Terra: Gets Dispel instead of Magic Breakdown. Magic Breakdown is useless, Dispel there to counter Gilgamesh Retaliates buffs.
Yuna: Protectga instead of Shellga, for obvious reasons.
Tyro: Equips Faris' Aevis Killer+ and goes in back row. His damage is now almost meaningful!
Things I SHOULD have done but didn't: Give Lulu Drainga, so she can counter Strongest Katana and relive some pressure on Yuna.
RW was Shatterheart, because I figure stackable attack debuff couldn't hurt.
The only tough part I found was getting past Dayspring, since Strongest Katana means someone is going to die. Ultimately, I just needed to get Yuna to get Hymn of the Fayth cast right before Terra/Lulu/Edea fire off a barrage knocking him into the Weak phase. First time I try this, I botch it because Lulu faster than Yuna and yeah, oops. 2nd time, goes over well. AMUSINGLY, Yuna's Hymn of the Fayth w/ the FF5 Judgment Staff healed 2017. I use tactics similar to what I did with Titan to insure everything is in place, so Edea/Lulu can establish buffs before going into the next phase, and to insure Yuna had gauge.
Once I got past Dayspring, just routine things, have Terra cast Dispel at the Very Weak phase, and Tyro basically stops acting entirely here because I don't want to provoke too many counters. Edea dies near the end because of Memento Mori, but didn't matter.
End result of all of this? 1 medal loss on Ifrit to turns, 2 medals on Titan, split amongs Turns and damage, and 2 to Gilgamesh on Damage.
Also, Edea's Inaugural Parade really is a game changer for Mage Meta. It makes my previous failed whaling on Kefka's Mantle (an identical Soul Break) feel more vindicated, since it really does make a huge difference. Being able to use Faithga + Hastega without wasting an RW slot is quite handy. Also means I'm prepared for Kaiser Dragon a few months down the line!