These Hampton Bay / King Of Fans controllers work best with a zigbee repeater in the same room. Smart bulbs make poor repeaters. A dedicated zigbee peanut plug corrected all of the issues I was having. In the IDE before the addition of the repeater, I saw transmit failures in the hundreds. Now they are in the single digits.
Well, I unplugged the hub, moved the zigbee socket to the socket on the front wall of the house where one of the fans is. Left it overnight, then plugged the hub back in.
Just as an FYI, I installed this over the weekend and had an issue joining it as well until I added an Ikea smart plug to the same room the fan was in. From there I was able to get it to show up right away.
The room itself is my middle bedroom on the second floor and my hub is in my living room directly below this room.