I don't play SCH in Campaign. I used to, then I stopped when I had a revelation:
People in Campaign do not help you. In fact, they do more to harm than anything else.
Most of SCH's abilities get the greatest amount of utility the greater your party size is. And people in Campaign are very reluctant to party with you for some reason. If I'm lucky (and if a very brave tank is lucky), I'll see a PLD engage an NM and I'll invite them. Good for them. They get Stoneskin, Phalanx, Enspells, and healing love.
Here is the more usual trend. NM attacks the fortification. People stare at the NM. On my RDM or SCH, I gravity the NM, hoping people will be more inclined to attack it when its name is purple. Reality: I run around for 10 minutes or so, hopefully the NM wastes time casting long spells or using Mortal Ray which is useless if I'm facing away. More often, they come equipped with Feather Barrage or whatever it's called.
Or if you decide to go offensive and AoE Sleep and Gravity stuff, you will get the usual shmucks who will attack your mob and wake it up, but will make no attempt to get hate off it. What? You're not a job that can solo tank these mobs well? Well way to go, let the SCH tank it! I mean, he's got an Earth Staff, amirite?!
李張明 85/ RDM BST SCH