I know from the Silver Phoenix I raise and the people I visit with their are a couple of things to watch as you breed and select future breeders. The chest should be a solid black in color. In some strains (some of mine) you have to fight that to clean it up and get the solid black chest in the males. The other thing that most US Phoenix (especially hatchery stock) don't possess is the upward blade of the comb. The Phoenix should have a comb that has the back blade off and pulling up away from the back of the head. This is somewhat unique to Phoenix and most hatcheries completely ignore this, as they do many other traits. And, of course you always want a long and full tail and sickle feathers, in both the roosters and hens.
Good luck!!!