No,It's not marek's, Some chicks aren't meant to hatch due to whatever.Any time you help a chick hatch it usually don't make it. You know the saying only the strong survie. Private flock it's not necessary. No, No,........
First problem, It shouldn't take 3 or 4 nights to do it. Make sure it plenty dark enough.I did my rooster that way. Second problem, Put a single nest box on the ground with the golf balls get her use to using it then take it away.
Keeping the feeder full. One chicken can eat a quarter pound of food a day.So it takes alot of food. Feeding them out right every day and missing the same time every time can cause stress which could hurt egg production.