You need to measure the temps in the egg box and if they are too low you will need to adjust your t-stat setting until you achieve optimal temps in said egg box.
Some people place their t-stat probe on the heat tape and adjust accordingly until their egg tub reaches desired temps. (same principal as rack setup)
Some people place their t-stat probe in the egg box, careful with that as toward the end of incubation eggs generate heat, which would make the t-stat run the temps cooler for the other tubs. (not by much but still)
I place my t-stat in a dummy tub, it is set like an egg box but does not have eggs in it, I tape both thermometer and t-stat probe on the lid of the tub.
I take temps measurement in two places at all time but also use a temp gun if checking clutches.
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