I just put my 3 bantam eggs on lockdown. I was able to get the humidity up to 65-70%. My problem is it will only stay up if i keep the plugs in. When I try to take the plugs out it drops down to around 55%. It is my understanding that both plugs need to be taken out when you get close to hatching because the chicks need the oxygen. Am I wrong about that. Is it okay to keep the plugs in to keep the humidity up? Anyone with some advice please help.