it’s always stressful whether your first hatch or 100th as something can always happen to change the game. is the set temp on your incubator able to be calibrated to match the temp reading in the center?? if so, that would be my first suggestion. then I would set the temp so that warmest area stays around 100.5 and rotate the eggs as planned. at lockdown, place all eggs touching near center and lower temp to 99.5. slightly low is better than too high...temps 104 are deadly. others may have different opinions......