In terms of damage for M+, part of the problem is damage vs. globals compared to other healers. Sunfire or conc are great at that, Spinning Crane Kick is pathetic in terms of damage per global spent.
To change that, Spinning Crane Kick should get a cooldown for MW, but do significantly more damage on cast so that it can do more damage in a single global.
I also think they should add a Crackling Jade Lightning affect into thunder focus tea that makes it AoE and do a lot more damage so Mistweavers have a ranged damage button to press that isn’t worthless.
While this wouldn’t solve MW mana issues entirely, after playing all 5 healers at 60, I find it highly obnoxious in 5 mans how different they are in terms of how often you feel you have to stop and drink. Maybe one solution at least in M+ since it’s on a timer, would be to give a buff in M+ specifically that increases out of combat mana regen by 5-10x or something so that all healers basically get to auto-drink out of combat on the move. Then they wouldn’t have to find time to sit and drink in a timed dungeon and the differences in mana efficiency between specs wouldn’t matter as much.