With regards to dpsing as SCH I tend to adlo the tank before each pull as it gives me time to throw my dots up and bane (if multiple enemies) and put down my shadow flare, then if needed I go back to healing. I'll always pop the tank an adlo if I'm about to go into cleric again and I have my fairys macrod to heal target of target to give me more dps up time. The more you play the class, the more comfortable you will be stance dancing, it's all situational.

If you're running a bit low on MP then use energy drains on enemies, especially if your aetherflow is off cooldown and ready to use. It will save you from wasting stacks and you should really not run into much MP problems if getting into the habit of doing this. You also don't have to be in cleric stance for this either as it will recover the same amount of MP regardless.