Bee, bet you had a rougher night than those almost-chicks! So glad to hear that one is still moving; it bodes well for the others. Still rooting for them!
Wondering if the age of the embryo matters with temp spikes and dips. I would think they would be much more fragile in the first
trimester week, as damaging even a single cell could affect future growth in a big way. Yours are older so hopefully can handle temp variations a bit better.
When you say they got to 104° was that the water wiggler temp? The broody patch gets to 107° so at least a portion of the egg can handle higher temps for a period of time.
Keep up the good work!