BSF like a humid environment, but the colony will have trouble if it's too wet. Being saturated leads to a lack of oxygen and the risk that the pile will become anaerobic. That would promote some bad types of bacteria and the BSF avoid anaerobic (no air) conditions. As long as it's not totally saturated they should be fine.
It's a mess right now, but the bin is only 4-5" deep at the center and half that at the edge. I'm going to add more dry stuff and not worry about it.
I wish the bluebirds had used the neighbors nest boxes, I'd try the larvae out on them.
