So I finally had a king slime spawn and stuck him in a safari net. I've placed it in my auto spawner which has plenty of poer and juice, and is an area 11x11x3. With exact copy set to yes, the work bar reaches the top and nothing happens, with exact copy set to no I do get smaller slimes spawning (even a skeleton riding a blue slime a couple of times, that was weird). I am playing in single player.
Can anyone tell me what I'm doing wrong?