I have a simple and great fix for Energy Drain.
Instead of costing Aetherflow stack, it should cost Fairy gauge.

So people will use all their Aetherflow stacks on healing (which should please Yoshida).
Fairy Gauge will become very useful (adjust Fey Blessing and Aetherpact to give them more weight to be competitive with Energy Drain).
SCH is rewarded by using his heal giving him an access to more dps.
Dissipation will become also more rewarding to use.

Note : Fairy gauge will appear at the same level as Energy Drain then.