I am considering getting Bielefelders again. When I had them before, I think they were too inbred because I got relatively few eggs (though they were jumbo sized) and they hatched poorly (maybe too big an egg). At the time my Welbars were just getting to be properly autosexing and were laying circles around the Biels, so the decision to focus on Welbars was easy. A good friend has a line that is going gangbusters for him. He had to source a male from a different breeder because all his chicks were female, so perhaps that outcross was the "trick"