Hang in there with the coppering coming in. The cockerel I have as my avatar was showing zero, zip, nada, coloring of the hackles at age 11 weeks! I was really thinking he would never get any because he is so dark. Now, at 12 1/2 weeks, it is coming in! His two hatchmate brothers both got their hackle color showing at around 4 weeks. I also have 3, 5 1/2 month old pullets who up till now have had very dark and sparse hackle coloring. It is now starting to come in a bit brighter and is extending, so after their first adult molt, I believe they should all show more. I think it also depends on the different lines as to who gets what and when! Good luck, and hang in there!