Thermometers are not like old stoves. They don't say low, medium, high. They have precise digital numbers. Mine, for instance, reads 99.6 on the eggshell.
What does yours say if you take the temperature of the middle of the side of the egg? In the area highlighted on the picture?
When you change the temperature setting on your incubator, it will take a few hours for the egg to reach its new temperature inside and out. Don't make changes based on what happens in 5 or 15 minutes.
Edited by WalnutHill - 12/8/15 at 10:13pm