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I've tried this and it doesn't work for me. I keep mine at 100 degrees (more or less) still or forced air, with the thermo midways of the eggs. How in the world are you supposed to get the thermo at the top of the egg anyway?? I just lay mine (white
walmart cheapos) on top of the turner rack.
If you measure temp at mid-level on the egg, instead of at the top of the egg, of course 102 won't work for you. The reason is that in a still air 'bator, there are layers of air at different temps. At the bottom, it's cooler, because warm air rises. So at the bottom, on the wire, it may be about 98-99, center 100, top could be 101-102. If
mid-level were 102, your tops would be 103-104, which might kill the embryos.
In a forced air 'bator, the temp is more even throughout, as the air is constantly moving, so you don't have the layered temps effect.
The target temp to hatch a chicken egg, (or turkey or guinea) is 99.5-100.5F. So still air achieves that with the average temp between the top and the bottom of the egg.
In forced air, there is no average top/bottom, both should be the same, or so close it doesn't matter.