In terms of an aetherflow sink, I'd be more inclined to have a HoT versus energy drain. Something we can use more frequently to give to the tank to normalize their hp recovery/loss and augment embrace's passive healing on the side. it should be at the same level you get lustrate so you have a sink at a low level. Perhaps 15s duration with 75potency. There just isn't enough aetherflow options to use before you get excog.