Forgive me for just stepping in, but no line is perfect. If anyone ever tries to tell you they never have any faults in their line, do not walk, but RUN away as fast as you can. Due to the breeds used to develop the Silver Pencilled Plymouth Rock I'm fairly confident you will never totally eradicate the issue, however getting the majority of the birds hatched to not have a specific issue is doable. That's why we as breeders hatch a ton and cull hard. If we could totally eliminate a fault in a line, there'd soon be no reason ever to cull.
I totally agree.
