Nice Black Shoulder Pied chick. I am leaning towards hen but I would really like to see the shield from the top, I could almost see it in the third pic but not quite enough for me to call it for sure.
I used to correct curled toes right away by putting 'shoes' on them. Then I figured out that almost every chick will correct themselves within 24 hours. Assisted chicks are the exception and will need shoes more often than not. Patience and a little time will heal a lot of things.
I recommend layer only during the breeding season as they only need about 1 1/2% calcium and the cocks can develop problems with too much calcium. The game bird feed is the better choice. Try to limit grains especially soy, corn is fine during the winter when they need that extra heat. Adding...
This has been an awful year for everything, it isn't just you, we are all suffering from a late start to the season, poor egg production, bad hatch rates, etc. However, you are correct that the birds' nutritional needs affect the viability of the eggs. Beginning at the molt nutrition is vital...