I killed them first try so maybe I had luck but
Can you surprise attack the first round from stealth? I don't remember exactly, but anyway:
1. Grease both of them
2. Lae zel Menacing Strike, action surge, Menacing Strike (you can use a potion of haste too if you have one before combat so one more attack)
3. The rest of the party attacks
Before they could get out of grease one was already dead, so it was pretty easy by them.
PS: pls don't nerf, make more optional (more out of the way like the spectator) if it looks too bad in your data
These fights are the best combat moments in the game.
