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I wonder why the Faverolles, in your and my case, are having trouble hatching on their own. I thought, perhaps, it was due to low humidity because the membranes seemed pretty dry. I made the decision to place a damp wash cloth beneath my silver-laced broody hen who's sitting on two mutt eggs from my own flock. I covered the cloth with shavings and when I feel beneath the hen it is a bit more humid and still warm. I'm hoping this helps, though when I candled the two mutt eggs they seemed a lot more active than the Faverolles embryos. The comparison showed an enormous difference in their activity levels.
I only have opinions based on loose ideas, but perhaps the Faverolles breeding is causing them to be physically weaker. I know with genetics this can happen where the breed becomes less hardy. It would explain why the mutt embryos appear (visually) stronger than the Faverolles embryos.
Faverolles do tend to be a more docile breed, too. Makes me wonder, in my own silly way, if the Faverolles chicks just shrug their wings after trying for hours and say, "To heck with it, if it's this difficult I'm going back to sleep!" like some people do. They don't seem to be fighters. My Faverolles pullet is huge compared to the rest of my flock, but she's terrified of them--always running into things and backing herself into a corner when she gets flustered even when another pullet so much as looks at her.