I have a pure strain of Chantecler. I am slowly breeding and culling to improve them for size and breed type. I find the main thing that needs doing is to feed them properly using high protein from day 1 including animal protein for the breeders.
I obtained 25 buckeyes but they too were inferior and not fertile between the males and females so I assumed too much inbreeding for what was available to me. Solution: forget keeping a pure strain of buckeyes and let them breed to the chanteclers. Only 5 buckeye hens and 1 rooster survived the coyote. Got 2 keeper pullets from that cross.
I had 25 Cx which I didn't have time to butcher and 2 hens survived over the winter and mated with a buckeye rooster and a chantecler rooster. Result was 2 really big amazing roosters and 6 good sized hens (one grey the others white with a black feather or two). They are aggressive free rangers and very healthy. The 2 Cx hens are 2 years old and still going strong.
I raised another 20 Cx over this winter and ended up with 9 pullets that look like they are going to do well and survive like the original two. I will divide them between a chantecler, a buckeye, and the best hybrid rooster from last years Cx cross when they start laying. Cx tend to lay an egg a day when they start and because they lay large eggs, I take a chance on hatching them out sooner then ideal. The other Cx/chantecler rooster will be mated back to chanteclers.
My plan is to then take all of the results from the above matings and divide them up into 2 separate lines next year and keep hatching and culling until the offspring become consistant to size and egg laying. I really don't care about colouring although it looks like they have the potential to be sex-linked which is nice. ( a rust feather in the rooster and a black feather in the hen)
The Cx/buckeye rooster from last year will be my gold standard and all of the hens were just plain good. Just waiting to see how they do for egg laying. I may have to tweak that later.
I will post some pictures if I ever find my camera which is packed away in a box somewhere so no promises for pictures anytime soon as I don't have time for an involved search. Will do what I can, because that rooster is worth taking a picture of.