I have been setting eggs for a while and you always want to set the freshest eggs possible,if holding them they need to be gently turned a couple of times a day...if possible have an egg turner set up somewhere so it is done for you, and yes small end down , 7 days is the maximum I would hold...
I keep 3 thermometers in my cabinet style bator two inside and one bakers therm through the wall. I also have them set at 96 degrees instead of 99 so temp spikes are not as drastic....I dry hatch also by just adding the water when I turn off the turners and lay them flat for hatching,this has...
I am going to guess it is just stress of moving the chicks around and them getting a chill....I just moved my chicks that I had hatched myself and they ranged from a week to 2 day old and sure enough they were just fine and within an hour I could see one drooping. One has died so far another is...