I'm very bad with rating, but I'll give what I can!
Firstly, I'm gonna assume you're raiding 10mans, as your guild only ha 21 members ;p
I'd lose Blessing of the Grove and take Genesis instead if you want to keep your mana at bay.
I'd also suggest switching Moonglow with Furor, especially if you're running with a priest in the raid.
Get rid of heart of unliving, int is ALWAYS better. If you need more spirit, I'd get that from reforges instead. And as I said before, you don't have genesis, yet you focus heavily on mastery (which isn't necessarily a bad thing, ofc).
And if you are raiding 10mans, I'd get rid of Nature's Bounty. Only fights I'd consider that for would be Blackhorn and Zon'ozz (for the regrowth part of it).
So my ultimate suggestion is, Moonglow to Furor, get rid of Nature's bounty in favour of Genesis (keeping both Blessing of the Grove and Genesis for uber rejuv), getting rid of Heart of Unliving, and then ofc blancing out your regen accordingly.
My druid:
http://eu.battle.net/wow/en/characte...izdom/advanced