I ask for the strange reason that Icy Veins, and a few other sources seem to marry it with just Attonement healing, but tbh 25% seems too good a buff to pass up.
Are you all using AA on CD or near abouts?
And what spells are you using to stack it if so?
The reason I ask is because this all feels like very, very bad game design.
It's 25% with a high-ish uptime, so they really have to balance Disc around being able to do it on the dot/near.
If they don't, balance them normally to the level of other healers, AND give them a 25% boost, they'll be OP.
So it seems like to avoid the problem entirely we just don't have it.
Because we're going to have to use it.