How about Academy Rector? Also if your worried about boardwips Indestructibility is an obvious go to. You could have Replenish to bring back all the auras you lost as a back up. I agree with Serra's Sanctum.

Canopy Vista isn't EDH legal

Ya well thats because it hasnt even come out yet.

How's the voting going for Council's Judgment?

Without hexproof, how can you justify the heavy aura commitment? Don't you lose massive resources to a Swords to Plowshares? I'd prefer Sigarda, Host of Herons for what you're trying to do.

I've never had any issues with Council's Judgment. People usually pick the worst threats, sometimes it's a four for one.

The deck uses Sigarda and Dromoka as interchangeable generals depending on how many counters are at the table. It only takes one or two auras to get Dromoka into serious threat range.

I just want to say that I really like this deck (+1 for sure!). I'm not a fan of playing white, but this deck reminds me that white is probably the best color for enchantments after green, and that reason alone makes me want to play a deck like this.

Have you considered Exploration and Burgeoning? Those could really accelerate your mana base, and at the very least get you some 1-drop enchantments to quickly build up your board state.

Have you tried any of the enchantment based accelerants? Namely Utopia Sprawl, Fertile Ground, Font of Fertility, and Cryptolith Rite? Auratog could also be a decent backup wincon seeing as how Rancor is already in the deck.