Also, how many males to females do you have? You might want to cut down on the number of males you have, especially if you want accurate results and to create an actual sex-linked chick. Take your favorite solid male and your barred females to create a sex-link where the males will be barred and the females solid.
With so many males in there, and two you said that block the other males from breeding, those two are the dominant ones are the ones breeding your hens. Either one of them could fertilize the eggs you hatched.