I'm like Gita, I go by the feel of my eggs a lot.  I don't have one of those fancy thermometers that you can place a bet on.  I first get them to where they feel just right.  Then I look at the thermometer and keep it where it says.  I had a harder time keeping the humidity right at first, then I learned for lock down, no condensation on those windows.  And, pretty much, just fill the wells.  I won't let the humidity reading go over 62% on mine.  My bator does not cool down at night, even with the air on in the day, and a fan on in that room at night.  I have it set just where I want it, so I don't change anything from the time it is set where I like it.  I know how far to leave the door open for the air to get into that room, and I know that the fan on is good.   You get so you know what works for you. 
One more thing..if your eggs feel like they have a high fever...lower the temp.