I wouldn't turn it up as 'fetuses' s/b old enough to 'start' better holding their own with temp a tad lower. Try your best to find another means to accurately compare the two...
I ran straight to the pet store and bought one of those digital temp gauges, that has the cord with the sensor at the end, for aquariums... reminds me of a miniature version of those wire cameras you always see the swat teams use in the action movies...anyhoo, I place that in one of the vent holes and suspend it a hair above my eggs...without having to open the bator.
I usually have them tilted in their egg carton on a home made piece of cardboard box folded into a triangle, wrapped with rubbery kitchen cupboard liner so as to safely angle them at approximately 45*.
When they are in the tilt mode I suspend the sensor just above the middle row of my eggs and can adjust it as needed to read who's doing what in their respective row.
As long as your humidity is in the proper range, they should hopefully be ok...(?) I'm with you, my first hatch and learning as I go.
Also read that if temps aren't in 'optimum' range (before-during-after lock down) chicks have the potential (more so) to hatch early, on time, as well as late!
Enough to make ME want to pull out my hair. Which I would gladly give for some healthy happy chicks....
Wishing, hoping, praying for your little clutch...
Take heart as we can only do what we can do, unfortunately, the rest 'ain't' up to us. THAT would be too easy wouldn't it :/
~For other newbies out there, like myself, remember the simple truth, heat always RISES, no exception with the still/thermal air bators...unless your up in the thinnest of air maybe(?)~IDK.
