Thats how it went for me tha last few times also, get the initial hatch then nothing with the rest, pipped or not.
I cracked open eggs, to find fully formed chicks.
I think its from humidity too high in the begginning, causing chicks to drown at the end.
Thats just my theory, I am testing my current batch with lower humidity, but it might be too low now.
I would try to take a couple that are pipped, and carefully open them.
You have plenty of good babies, so its not like your gonna lose out if a few die from trying.
PS- I havent really candled these eggs from slavik too much, but I did last night.
Over half were clear, I am not too happy with that.
He mighta had young birds or not enough males . . .
At least Im getting SOME nice big jumbos . . .
Im just worried about the chukars, it seems almost every single egg is developing . . . thatsa lotta chukars
Imm make a call to my breeder again when both bators are empty, itll be valleys and gambels next time hopefully, Tim has good eggs.