So Resto Druid is great, but I just couldn't get a feel for it. The hots felt like they weren't ticking for enough and couldn't get the kind of rotation I wanted. Burst healing also felt weak.

Resto Shaman is amazing for boxing, as chain heal is powerful and a smart heal.
Mistweaver Monk is also amazing, they have great passive aoe heals and extremely strong single target heals. On top of that they give you 5% melee damage buff, which includes hunters.

I have not tried Priest or Paladin this season but I did do Holy paladin at the end of legion briefly and it also didn't feel smooth then.