On off-tanks I try to do 2HP, on myself and the MT 3HP and then on some fights with heavy single target spike I'll save 3HPs for that point, otherwise I'll blanket the raid with 1's or 2's depending on how much AoE damage there is
depends on the fight lately. I was on the whole 3hp or no hp stance. But certain fights mechanics have left me changing that pov. I'm doing something similar to was Xs mentioned above