Any harvest is great!
Heres my $.02, consider this with your experiences, I may or may not be correct.
I found eggs a week ago Saturday 7/19 and made sure they weren't from laying workers. I went into the hive tonight to check on the honey super and to see if there was any larva or capped brood. I have both but it looks like all the brood are drones and I also found the start of about 6-8 swarm cells. They have had plenty of room, I've moved the honey filled frames in the hive bodies to the outside and they still have two or three frames in the hive bodies that aren't fully drawn (all starter strips of 5.1).
This indicates to me that you have one of two problems: 1. drone laying queen (badly mated or unmated) or 2. Laying worker.
The 6-8 swarm cell starts that you mention suggests a laying worker, often with a LW they will try to requeen but without fertilized eggs....
If you can find a queen in there then she will need to be replaced. Either way you can try to add in a frame of eggs from your good hive and see if they try to raise a new queen, sometimes they do, sometimes they don't. But it is worth a shot. Otherwise do a search for laying worker, it is a fairly common problem, but not an easy one.
Rick