AHB can still be a concern, although, it's an unlikely one. I heard from one beekeeper in PA, that he ordered a packages from Alabama, or Georgia, or thereabouts, found them to be the meanest bees he's ever seen and, on a hunch, decided to have them screened for AHB. Wouldn't you know it, the queen had mated with AHB drones and the bees were POSITIVE AFRICANIZED. Although, what your describing sounds like bees just in a fuss over the fact that there's no nectar to collect. The older ones are always meaner and when they hang around the hive, you notice them. And yes, I'm personifying.