Use Adloquium on targets that have less than 80% HP that you know will be taking further damage (generally tanks), and Physick on everyone else. Use Succor when the party takes AoE damage. I'd recommend using Eos exclusively and practicing placing her and using her skills manually (keep her on Obey and bind her skills to your hotbar somewhere). Rouse + Whispering Dawn is very effective for sopping up party damage, but it also works to help keep your tank alive. Practice toggling into and out of Cleric Stance to do DPS.