The best example I have seen using a Cornish X in a breeding project is duluthralphie's toads. This is from his thread
https://www.backyardchickens.com/threads/toad-raising.1152440/
The Toad is a 4 step process,
The first Generation is Cx crossed to CX,, That is known as a frog
Next Generation is a Frog to a Dixie Rainbow, This becomes a lizard
Then the lizard is crossed back to the CX.
That gives you a toad, it is 7/8th CX and 1/8 Dixie rainbow. That little Rainbow gives a bigger bird that does not eat itself to death.
They are huge with more dark meat to white meat ratio. They are not lazy slobs.
Fascinating thread even if you don't raise meat birds.
I hope he doesn't mind me posting a pic of his, but here is an example of one of his processed toads next to a turkey of the same age.
Hopefully my chicks will be good.
) I saw at least two or three of the chicks struggling from the heat out there. I picked one of them up, and she just kind of toppled over in my hand, not being very active at all. After realizing my huge, huge mistake, I moved their little tub/pen to the front of the shed where it's still shaded, but wayyyy cooler, and added a frozen water bottle with a rag on it in there for them to gather around. All of them seem to be doing okay. I don't want to kill them! D: Had no idea they'd be this young.. the last two groups I got were also 1 and 1/2-2 weeks old, and these are 3-4 days old. 
