I've been loving this enchant quite a bit, however I feel that Penance should change to nature healing so it can scale with nature healing talents, as it is a key skill in this enchant, as it enables Tidal Shield.
As Penance is a channel spell and is needed for a key part of this kit, it's healing isn't great, which puts this kit at risk, I've been using it before fights just to keep the stacks, of course this could really break this kit make it meta or whatever but I'm just throwing this Suggestion out there.
Maybe add more epic/rare enchants to improve penance, as if memory is correct there isn't much in place, I'm biased Penance being one of my favourite skills