i had my bator run all day on 99.5 degrees empty. loaded 29 eggs watched closely for 4 hours and the temp stayed at 99.5 . went to bed woke up 4 hrs latter temp at 104. reset temps woke up at 6 to go to work temps at 102 reset again will check at lunch. what are the varations on temp better for it to be a little hotter than cold?live in old house and the temps in texas are jumping all around