Living dead was always a pain. Short of having a WHM benediction it's always been a waste of healer ressources compared to the other tank invulns. Now, it's really hard to heal up as SCH. Takes at the very least an excog, emergency tactics + recitation + adlo, and a couple lustrates to get anywhere. And if you don't have ressources available, GCD spamming by itself is simply not enough as you only have 4 gcds in that 10s window and currently that's about 100k hp so you're still short something like 30k (and that's assuming you have recitation and ET up). The usual solution is simply to not use it in solo healing content which isn't too hard. And to just grit your teeth through it if you need to use it without benediction in dual healer scenarios.