We never liked that flag room, too messy unless you have someone to lull and pull the mobs one by one so they pop one by one.
As I recall once we got past the zone and flag room pulls being useful we set up here:
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There are only two spawns in that room and that let us pull the Goblin Archaeologist at (4) and the Goblin Preacher at (6). If I'm remembering 20 years ago correctly, it was either that room or the room to the right of it.
And you could still pull from the flag room area if you need to.