So sorry for your loss, hon...
If my fertility picks up in my Legbar pen, I'd be happy to send you some...
I really found it is best to treat them like local eggs ASAP if possible... I feel at a certain point, damage within the egg is irreversible so no matter how hard you try with some they just won't make it... due to duck eggs doing best laying down, and especially Calls, I found I had better success with shipped getting them horizontal quicker and I don't go past 24hrs of upright w/out tilting... any longer and they stick to one side of the shell... in my experience, at least...

I think i recall something similar to this, Ruby... that could have come out of the Paints... depending on the blacks used to breed into the paints... some blacks have been known to pop up with partridge occasionally... I think that *might have* happened...

Probably not... I'm not too familiar with different types of bators systems really... your best bet is to get 2 or 3 different separate thermometers and hygrometers, calibrate those, and keep those in the bator... never rely on just the bators thermo/hygro readings...
That is so sweet!! Growly is common for an Am broody... will she let you get under her though? Mine growls and puffs, but lets me do what I need too...