By the time you're going into hard content that Eos can't just carry, you already have aetherflow. There's no level where Adlo spam is a thing.

Fey Blessing is just such a nothing ability that it's primed for the axe, personally I'd just add an upfront heal to Whispering Dawn or reduce its cooldown via trait to replace the heal potency. (it can't be replaced by a higher level ability, that just adds an awkward gap)

In terms of their damage kit any solution other than unethical DoT mage would just be incorrect. I'd like to see Deployment gain it's PvP functionality compared to a different ability just to spread DoTs though.