comparing your healing to the other monk in your raid in oregorger.
his RJW healing amount is over twice as much as yours. Your lack of spirit (~1200) compared to his spirit (~2000) is a big factor to that likely which strains your mana way faster than his. Your chi generation is good, but I think you can make more use of expel harm as it has good chi-for-mana without expending Renewing Mists needlessly.
I might add more to that later, for now I have raid sorry I don't have a lot to point out