We did win one run without Bolster and frankly we didn't even notice until the GEO told us.
I think (not 100% sure) he was using Indi-Malaise, BoG/EA Geo-Frailty, entrust indi-languor.
COR buffs were uhm... Beast and Drachen rolls I think.
Food was Akamochi for all of the
Three SMNs.
Gambit, Rayke and Odyllic Subterfuge were up.
The GEO was using Dia2 on the main NM.
Everybody had Barblizzard up before pull.
SMNs of course used Astral Flow before pull, gives a lot of stats (and in return more damage) to your avatar.
Also make sure to use Ifrit's warcry before pull, gives like ~10% att bonus to your avatar as well.
Don't bother with Apogee pre-AC, fight is too short. Just spam FC right after AC.
Keep in mind if your avatar is facing the main NM, there's a chance he's gonna guard some of the FC hits.
This wasn't an issue for my runs so we didn't bother, but just saying.
I guess some of these small things are irrelevant when you go with three competent SMNs, but when you have only 2 you need to stretch every bit of damage out of those 30 seconds.
Make the fight last too long past those 30 seconds and it's a wipe.