Aw, man...
I don't know what the deal is, but I think this has been a particularly tough year for hatching for a lot of people. I've heard (vaguely) some speculate that it has something to do with the feed that the breeder birds are being fed. Not enough animal protein or too much soy protein... I really can't say.
I know that what I'm going to suggest will be difficult to carry out with Faverolles bantams due to their rarity... You would probably have better luck getting started birds and then incubating the eggs that your own birds lay. I know you have one cockerel (he should be fertile by now). Maybe you can ask the same person you got him from if she has any pullets or hens that she could part with. Granted, she's probably going to charge you a lot more for a girl. If I weren't having my own problems getting a breeding group of Favs started, I'd offer you one of my little 3-m.o. pullets, but right now, I need to hoard every Fav I've got
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None of the big hatcheries have Faverolles in bantams, but I think Catalpa Grove Farms (Gayle Pontious) ships chicks (salmons and blue salmons), and maybe started birds, too. It's very expensive to have started birds shipped, but at least you know you're getting something for your money. With hatching eggs, you can pay an exorbitant price for a dozen eggs and very possibly get a zero hatch. You can go to Eggbid and see if anybody sells bantam Faverolles chicks or started birds. They probably wouldn't be selling anything now, but if you do a search to include past auctions, you may find a few sellers.
Gosh, I'm so sorry about the difficulties you've been having. I just know that if you incubated eggs from your own birds, you'd have excellent hatches because I know what kind of foods you're feeding them... Unfortunately, there's really no way to know what breeders are feeding their birds (unless you ask, of course) and if the hens are not getting everything they need, then the nutrient reserve in the egg (yolk, of course) is poor and often won't sustain the embryo for the full 21 days. OR you hatch a weakling that won't survive...
One lady I know had chicks hatch after Day 30! That's really a miracle, though. She thought these eggs quit at the very end but she wanted to give them an extra day or two. Then she forgot about the incubator completely (leaving it on) until she heard some frantic peeping coming from the room with the incubator like a week later. There, in the bator, were three perfectly healthy, fluffy little peeps *desperately* wanting out... Anyway, before you toss them, if you're not comfortable candling them, at least do the "float test" in a glass of 100 deg F water. If something's alive, you'll get ripples on the surface of the water. If not, then nothing and you can toss it.
-Naomi
