A hive swarmed about 3 weeks ago. Ever since there have been a large number hanging around the bottom entrance. Since the swarm I have added a second brood box, bringing the middle 4 frames up into it. And also added a queen excluder and small honey super. Still no change. Is this just variation between hives? There are no queen cells and the weather is cool/cloudy with showers. Any ideas would be appreciated, thanks.