Many thanks to the folks in the Valhalla farming thread for missions. Randomly, the following post completely changed the way I farm:
I never put together the fact that minions + health boost can bank a ton of health going into the boss fight. Of course, I’ve played rather casually for much of S3, and so I missed how useful the health boost can be for auto-play farming.
Currently, the following is my new farming team for S3:24-9N that has not even come close to losing for the goo and teak missions in S3:
I can’t stress enough how much time embleming Gullinbursti (I already had it levelled) has saved me by letting things run on their own. By the time the bosses get through a minion/health wall, Viv+Gulli remove ailments, buff, and add back more health. For the mask/Bera missions I simply used Fenrir and Frida instead of Telly/Lianna.
Thanks, @Shunt for opening my eyes to the inadvertent QoL improvement these health boosters provide!