Lol so my attempt I used the same strategy you used, I was puzzled why I failed and you succeeded. Oh... Tidus USB and BSB2 I thought, my Tidus only had CSB. My Shelke entrusts had nothing good to be used on past the first two
I decided to pull on the water banner. Orlandeau USB is crazy but I'm very strong in FFT/Holy and have most of the banner already. Bad luck would mean wasted mthril.
So I pulled and got Tidus BSB2 and USB. I'm a lucky bastard!
...
I think Magic Blink is nessesary for the weak phase, two Savage Firagas in a row is too much... sub 30 is great but it's not easily farmable for me like this.
Nice! Congrats on the clear!
What I've found:
For me it's about 50% S/L which is a pretty solid farm. I've been using a level 1 Liquid Flame Magicite for the 3% dampen fire, it made a big difference in my survivability.
Currently for Magicite I've got: 99 Enki main with subs of 99 Phantom, 99 Bottomswell, 99 Hombaba, 34 Liquid Flame
That gives me 15% more water damage, 6% extra crits (awesome DPS for early chain usage), 40 ATK, 30 MND, and 3% dampen fire.
Enki in main slot resets my fire imperil and seems a little more reliable than running the whale which so often would block a regular firaga.
Your team should have more survivability than mine - Eiko only Curadas for 5.2k and her burst (which I get off twice) heals for much less. For heals I run shellga-Curada-burst-Curada x4 (ish)-burst-Curada, with Mako Might. My team just barely survives waiting for that third turn burst but it's pretty rare I have someone die (less than 10% of runs).
I imagine your Tidus rotation is similar to mine - I lifesiphon til 12 seconds (or so), then chain, with entrust landing right after chain goes off, then do BSB (instant entry), then instant USB, then instant sapphire shot, then instant USB (thanks Ramza USB) into instant USB into instant USB.
Shelke opens with instant wall then wraths until 13 seconds, then entrust, then wrath 2x, entrust and then defend. She's a Tidus battery that feeds his instant casts.
I also use Celes' 40% spellblade damage on Bartz, 40% blitzball on Tidus. He and Tidus both have dual +water gears. I've thought about testing 30% sword on Bartz instead but I don't think it will make much difference.
All in all I'm pretty happy - my endgame water investment paid off and I didn't have to use any orbs. I put a lot of mythril into this team and had average-at-best RNG in getting the relics. I may not be able to clear all the new magicites on day 1, but I was able to jump into my best element using only 3* magicites and farm sub-30.