Being in a turner shouldn't affect them, that is assuming you have them in a turn that hold the egg up and down. As long as the aircell is up, there shouldn't be a problem with that. As to the humidity, if you use the dry incubating method, then yes, the humidity could be an issue. If you have been keeping a standard humidity of 50% or so, there shouldn't be much of an issue as long as you have your hatcher at the humidity that you want for the hatch and can keep it there. If you are really concerned, you can always wipe your eggs with a warm moist paper towel or mist them.