I've played symphony a bit and I love the set in general, and the idea of a full conical control set is really relaxing to sit black and play without having to change between PBAoE, TAoE, Cones like most control sets.
My one pet peeve is that there's ONE cone with different angle and distance than the others, and it's the one that really should not be.
Hymn of Dissonance, the AoE root is shorter and wider than the other cones. It should be the same because you'd be able to simply follow up with other cones in a relaxing playstyle. If they got rooted, they'll get feared/asleep/stunned, simple as that.
But it's not only wider, that causes you to miscalculate, it's also shorter, so you are forced to step closer to the enemies (I like to target the last enemy behind the group to hit the whole group); But stepping closer makes the other cones have less area since they are narrower and you are closer.
Would it be too bad to just make it like the rest of the cones? It'd be an overal nerf to the area, but so much smoother to play.