Out of curiosity, what's your rotation in day phase? Usually I use life cocoon on first breath put enveloping mist + 2x surging + enveloping mist refresh just before buff goes of.. on next breath I use TFT to boost surging mist.
We are 3 healing with paladin-shaman-monk, right now our strat is that paladin takes buff first, then shaman, than me (monk) so we can all use our cooldowns with it, do you delay the buff to make it fit with the breath?
Here are some logs, granted my gear on my alliance monk is pretty bad, but I've seen monks do 300k hps on that fight so obviously I can improve it.
A resto shaman also have good cooldowns to blow on the boss, so this is why we're trying to share the buff. And yes, don't do like me, I clicked the damned buff and had to dispell the boss right away and I didn't notice it changed target, so ended up dispelling myself and put my detox on cooldown, which obviously lead to a wipe...