What you are describing is a very over full and crowded bee hive! If you saw swarm cells, they are about ready to leave, at least most of them. Did you ever super them or did some bozo tell you that a new colony NEVER produces a surplus the first year? I would immediately split the colony into about four parts. Give each part a couple swarm cells and destroy the rest. Give each split an uncrowded box of their own with room to expand. This will hopefully cut your loss to swarming and after the swarm fever has subsided, you can just stack all four together and recombine them into one colony for wintering.