Mine would go from having firm poop to splattering within the same day. Some of it seemed to have to do with how much water they were drinking. Also, a lot of the food seems to pass through without being digested.
Now that I don't have the CX, I am amazed at how little food and water I am using for the Red Rangers. For 5 CX and 9 Red Rangers I was filling the 3 gallon water container at least once a day. Now I can go two days for the 8 Red Rangers I have left and the mother hen and chicks I have running with them.
Cornish X's are different from other chickens. I did not know how much until I got these 5 chicks. I don't know if I would ever raise them again because they kind of give me the willies.