Lockdown Egg Carton Question???

When I move my eggs from incubator to the lockdown incubator on day 18 because I do staggered hatches, I put them in a cardboard egg carton with the top lid cut off, I have heard it keeps it cleaner in the bator and also keeps them upright like they are the first 18 days. I am having batch hatch rates and they eggs do great up until lockdown. My humid and temp are fine, but could them in the egg carton not let them get humid or the right temp since half the egg (the bottom) is covered by cardboard??!! I guess I can just lay them in the lockdown bator on the wore floor, but that's my other ?, if incubated large end up for the first 18 days, if I lay them down on there side for lockdown will that effect them hatching like positioning inside and will cause for a bad hatch rate? Any help is appreciated. Thank you