I think AoW needs a bit of a reduction to it's mana cost. I feel like 15% would be a good number but this depends a lot on actual data from the player base and only SE has that.
Thanks for the extra info!! Especialy the faerie name. Updated my post.
Regarding AoW, I'm basing this off of wall to wall pulls with 2.2K piety. Also comparing it to ex trials where I have so much mana it's ridiculous, there's a big discrepancy here. I'm also going to say that in the past 90% of my expert roulettes have had lukewarm party dps and this is a trend I don't expect to change. With all that in mind I felt like a 15% reduction in AoW spam was a good spot. That's one more cast every 6ish casts so not that overpowered. It also doesn't affect the other content like another management tool would.
I also think shadowflare should share a cooldown with sacred soil. That would be a lot of fun.