humidity levels

I know that incubation is roughly between 18-21 days but I've got 1 egg in my brand new brinsea advance bator that's doing really well. Should I go into lockdown on the 18th day or wait until near the time when the egg shows first signs of internal\external pipping? Tomorrow will be the 12th...

So ive been monitoring the nest box and the humidity levels aren't staying where they should be . They are siting around 26% i put a plastic baby food jar in there with holes in it and water about 1/4 full and it still isnt helping . What else can i do to keep the levels up ? I also have been...