Are you talking for hatching? I keep mine at 20-30% for the first 18 days, will let it run to 35% if it does so easily and if the eggs can handle that much. Then bump to 50-60% when they start peeping and pipping. This works for me; last year I had even some duck hatches that were 100%I understand you there. I'm having trouble keeping my humidity up high enough, too. It wouldn't budge above 40% for a little while, so although it was on the low end, I thought it was ok. Then today, I noticed it was down around 36% all morning, so I doubled up and filled the second channel. It went up to 39%, but no more. I have the vent nearly completely closed right now hoping it bumps it up, but it hasn't. For the instructions sounding so simple, it definitely isn't! I'm glad these aren't any expensive eggs. Heck, I'm just glad I didn't have to pay for them. I may have to find a better humidity and temperature sensor. The AccuRite model I have may not work in the long run.
My house is sitting around 70*F all day, so would that be part of it? We don't keep our house any warmer than that during the winter.
Right now with no water in the bator it is 10%. I heat with a wood stove, so will start setting a big pot of water on the stove at night to get the room humidity up.