Monks when played properly take much less damage overall than other tanks, we have the tools available to mitigate a lot, and have a couple of "ohh shit" buttons.
Just ensure that they are keeping shuffle up at all times during his melee attacks (you can build this up when he is doing his aoe swings and not hitting anyone, as well as build up elusive brew stacks during this time). that way during his melee burst you can use your chi for things like chi wave/guard to help the healers out.
Also, the mastery buff does persist through death
Your monk heal is using uplift too much. Ask him to spend more Chi on Envelopping mist (maybe it's him healing the monk ?)
Now going full retard with my Enhc Shammy : http://eu.battle.net/wow/fr/characte...antoast/simple