Okay say my problem is ventaltion related and I drilled some holes. I always read about closing the vent holes and opening them up on day 18. What do you suggest?
I wouldn't drill any holes just yet. Get new meters and check them, then set it up just like you did for this hatch and see what the actual readings turn out to be. And adjust from there. I truly believe the incubator itself is giving inaccurate readings. Then try a new hatch with accurate settings. And leave the vents open all the time.
In my signature line is a link to my humidity article that may also be helpful to you.