@ronott1 is one who swears by cooldown periods for better hatch rates. On my own eggs, I can’t improve the hatch rate.The Brinsea I just purchased actually has a programmable option for a "cool down" period. It's not a default setting, but you could add it in if you wanted.
However, when I move eggs to the lockdown incubator, I candle the ones in the other two. This whole process takes a good 15 minutes. Each egg goes through three or four such cool downs.