I had a hive that was booming after it was split in early spring. I just noticed a lot of swarm cell activity that has taken place in the last 7 days. Approximately 5 frames in two deeps had 2-5 swarm cells each. They did not seem to want to draw the super I placed 3 weeks ago, and only now just started drawing it out. It was too late though. I don't have spare empty comb to swap in. Do I have any options besides splitting again? How do other beekeepers keep massive hives with multiple supers on them without them swarming? Is it just proper timing on placing the supers?