Personally I'll pop vengeance or rampart after a pull just before I'm about to get hit and depending on how long it takes for them to die I'll pop the other or convalescence. I usually use thrill of battle and equalibrium for spot HP if I'm low. Raw intuition coupled with awareness is usually last for me. Holmgang for pulls is the emergency last resort but I usually only use it for tank busters where my other defensive cooldowns aren't up or I'm not at full health/I'll die if I don't use holmgang.