the way i look at sage in dungeons at least, is there's a bread-and-butter combo of krasis, physis2, kerachole. you wont have krasis yet but dont worry about that for now, its for the explanation. due to the short cooldowns, these are basically up on every wall to wall. after that, you can use 'top-ups' as needed, and rotate them as you go through the pulls. for example, first pull you could 'top up' with haima and soteria, the next you could do holos and panhaima. you can even use pneuma (at 90, in your expert rouletes when you get there) as a top up tool, it's very good with zoe to make it 900p. as mentioned too, once kerachole falls off, you can hit the tank with taurachole, to reapply the same mitigation (and heal them a bit), then once that falls off (if the pull is still alive) kerachole would be back up. this gives you up to 45s of 10% damage mitigation on the tank!

unfortunately for raids im a WHM main, so my method to playing sage is quite literally 'wing it'. still cleared hard-ish stuff with it despite this, but i'm not gonna be winning any awards for my performance in there lmao