16% is ok...if molting you are doing well adding more protein. I buy a bag of Calf Manna, and just throw out a handful around twice a week. If they were molting, I would do three times a week. Also, scrambled eggs are great for them. The cracked corn..not needed so much during the warm months..save it for the winter! Unless..you are living in Texas, or AZ...?? Somewhere warm. Then I would give it to them once in a while for something to scratch up. Sounds like you are giving them a good enough diet without the cracked corn. It get cold here in the winter, they get the scratch, and..they get a can of corn every now and again. Helps keep the fat on them..and warm.