I'm still confused as to how everyone's seems to be focused on MP costs. I mean, Summoner relies on DoT's largely, and you've got Garuda to extend their duration as well. It's not like you're endlessly spamming expensive spells like a Black Mage, and the big hitter (Fester) doesn't even cost MP, instead using up Aetherflow stacks. That's before even considering that Aetherflow can be used every minute and it recovers 20% of your total MP each time.

How are you eating up so much MP so quickly that this becomes such a heavy burden for you? Resurrect shouldn't even be a factor here.