I don't have experience with this myself, but my good friend and breeder of my redfoots has successfully fixed cracked eggs with white candle wax, that he melted over the cracks.
Now I can't tell, if his cracks were lesser or worse than yours, but it might be worth trying, if you feel you are going to loose them otherwise.
Apart from that you should also try of course to correct the incubation conditions as Ed already suggested.

Good luck,
Gaby

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