Threeof the six have pipped externally - the one Cayuga, one of two WH and one of three Pekins. One of the Pekins looks like it has stopped. No movement or tapping since last night. It also has a mottled looking shell. The other Pekin and WH are still tapping on the shell. I can't get our HovaBator Genesis past 75% humidity on the hygrometer. I have filled all the pans and added a sponge in a pan. Should I assume my hygrometer is not accurate?