Sorry about the loss of the chicks, hope the rest of them are fine. It sounds like you are doing all you can for them. Even without shipping stress, some chicks have internal problems etc we can't see, and can't make it.
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It seems to me that when I lose baby chicks that it is because of one of two things.
One. They have gotten chilled during shipment or when washing butts. I no longer wash butts, I just pick it off when dried. They can die up to a week later after being chilled.
Two. The egg was not clean when put in the incubator. Bacteria can enter the egg and kill the chick up to two weeks after hatching. These chicks are usually poor eaters and fail to thrive.
I don't know if this would be your problem but It's the only reasons that I can think of.![]()