This encounter can be so trivial if coordinated and done correctly. Please post feedback about the strategy of staying in Pyroguard's room.

That's a losing strategy, in my experience. The encounter is very straight forward, if only you concentrate on killing the hatchers fast, and since it is impossible to keep the hatchers from going for the eggs, you really have to be inside the rookery to have LoS on the hatchers and for the healers to have LoS on the melee-dps on the hatchers.