Convalescence doesn't effect Bloodbath's healing (Conv only affects healing magic), you usually want to save Convalescence to pair with Thrill.

Thrill + Conv, Vengeance, and Raw Intuition are your big CDs that you want to save for tank busters (Raw Intuition is useless against magical tank busters, though). Bloodbath and Foresight are used on CD, Bloodbath often best paired with offensive CDs (Unchained, Berserk, IR) while Foresight is just useful for mitigating fluff damage as often as it's available for. Second Wind and Equilibrium are best when under the effect of Berserk, but basically just used in a pinch (no heals incoming, at critical health, tank buster incoming, etc) or after a tank buster. Always use IB @ 5 stacks unless Infuriate isn't available and a tank buster is coming up in a few GCDs.

If Unchained is up and no tank buster is coming in the next ~20s, it's better to use that over IB.

That's the basics of WAR mitigation/management-wise. Stuff changes from fight to fight and WAR has a lot of leg room for mitigation, so as long as you're not dying and your healers aren't complaining then you're doing it right.