I didn't see any improvement post hot-fix but I think the Dryax fight is just bad (I'll come back to that in a second). Hoping to see some good progress tomorrow with Dedra + hero bonus.
The Dryax fight isn't a bad concept but we don't have the tools to approach it correctly. Take the Tomb Guardians fight: we always know exactly how many stacks they have and how many we'll remove by hitting them. Additionally, gaining levels is always a positive: you do more damage once their defenses are low/down.
In comparison, I feel like I'm constantly guessing with the Dryax. What are their comparative health percentages? How much damage is my next hit going to do? It doesn't help that, because of the way the fight scales, you do a lot more damage early such that it's way too common for an overleveled Kleya to drop one Dryax to red health on her first basic, putting them both in supercharged mode for the rest of the fight. tl;dr: please introduce a new boss to replace the Dryax fight next Era.