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hatching issues will be temperature dependent.. how low below 99.5?
I would continue to turn the eggs that need it (avoiding "lockdown")
as eggs pip move them off to one side so you can monitor them better.. if you see any membranes that are too dry mist the eggs lightly with a spray bottle (no need to drown the little guys)
chances are the eggs will be fine with their own humidity.. so if this were my hatch I would just leave humidity alone.. continue to turn eggs that need them.. and pull any chicks as soon as they hatch and have closed navels.. monitoring everyone to see if there are any issues.. and then if there are issues.. handle things depending on what arises.
chances are (depending on the incubator) that the main issues you will have will be from chicks that were incubated at too low of a temperature and not from being "dry" at hatch (but like I said it depends on the bator you are using)
Just be ready to step in and assist if needed.. watch especially closely any chicks that have zipped but have not popped open the shell due to dry rubbery membranes (pop it open for them if this happens) and any chicks that have a yellow residue at the pip hole (assist if needed)