The six to a room doesn't count because you had sleep side/study side. I know it had to blow having six to a shower after something like the E-course, but it still nets out at three to a room.
Were you in Obannon? I had four in my room (two rooms) in Obannon and it was cramped. I don't see how it would even be possible to fit six in the same space because there wouldn't be enough space for furniture. We didn't have any more room for desks, not to mention another bunk.