Since you started yesterday I will tell you that it takes time for the
incubator to warm up the eggs. If you go adjusting before the eggs
have time in there to warm you're going to end up all over the place.
I set mine up a day in advance to the temp I want and let it run.
Also make sure to place in a room with not as much fluctuation.
My best place for the LG's are in the basement because right now it
stays around 50 f. Another place is my closet in the back bedroom
because it is away from heating/cooling vents and stays about the
same.
Not so good places are The Kitchen, Living Room,
Bathrooms. Heat/humidity from stoves, showers,
open doors to the outside, can make them fluctuate
badly.
My still air LG's fluctuate from 100.9-102 in the basement.
My forced air LG's fluctuate from 98.5-100.1 in the basement.