Remember that every egg you try to hatch you will have to candle. Can you handle having to candle 84 eggs? I find the more eggs I candle, the more tired I get. I have dropped eggs that I try to candle when I'm too tired. You will have to have 2 incubators running, having to lock down both incubators. What if a bunch of chicks hatch early and the rest hatch late, where will you put them?
When they are hatching, or NOT hatching, are you going to panic the way you did with Thing 1?