I think an other way to simplify atherflow management :

Aetherflow : grant 2 stacks of aetherflow, restore 1400PM. 40s cd, 2 charges. Max 3.

By doing this, we keep aetherflow a dynamic mechanic, but it solves the urge to use it on cd and create more opportunity to manage Aetherflow. I think we could get rid of energy drain as we would only have 2 lustrate to waste on worst scenari every 40s (which would be rare on ex and savage content)

I agree dissipation is a mess and could simply be removed. I think of something to replace it, but it was way to similar at recitation which i think is a nice ability.

I think fey union could be a classic cd which make the fairy put an huge regen on someone for a few second. It would make it usable when Seraphine is out and free the gauge, which in my opinion could be used as full offensive. My though would be for some of fairy gauge, Ruin 2 is improved to fairy broil which is a instant cast, stronger than broil with aoe decrease. As it, SCH would get a moving and double weaving spell with no dps loose. It could also help feeling wasted lustrate not so waste.

I cannot think of a good separation between Eos and Selene, the only i got in mind would be AOE vs Single target heal, but it would need both summon to be instant ability.