I start with 28% game bird starter 50# then move to 22% meatbird and have never had a problem. Angel Wings is genetic weakness most common among water fowl or water fowl mixed in with chicken flocks likely prone to the same feed deficiencies, incubator humidity fluctuation and inability to process protein adequately. I stick with the advise of an old chicken man who said rule#1 don't breed inferior birds. The WR and Ginger are all terminal hybrids meaning high probability of genetic flaws like curled toes, cross beak, etc. They are not meant to be foundation breed stock for meatbirds. And birds that don't show those recessive defects still carry the genetics and can throw them out at any time. I maintain White Plymouth Rock roo and Delaware roo in two separate breeding flocks for meat and cross both roosters on a mix of White Plymouth Rock, New Hampshire and Delaware focused on producing F1 to grow out and process for meat. The heritage birds are heartier to heat/cold temps, bred true/truer and maintain breeding viabiity for me up to 4 yrs. I have adequate egg laying and produce males for processing at 12-13wks compared to Cornish Rock broilers at 7-8wks - correspondingly their finish weight is within 85-90% of the CRX. I cull the females at 8 weeks unless they are quality breeding candidates - they go into jars for the dogs. It has taken me three years to this point that involved multiple hatches throughout the year, rigorous selection and continual culling. So unless you're up to planning egg collection, filling incubators and can stomach culling chicks early then as pullets don't try to get into breeding meatbirds. Sounds easy but its not. The project takes a lot of time to develop, is a lot of work requiring two breeding flocks (that's 2X the feeding/watering/cleaning two coops/maintaining two runs) and it's expensive to feed these heavy weight birds manage their feed intake and maintain healthy birds 365 days per year rain or shine, heat or freezing cold. My heritage breeding is intended to be a sustainable effort - I still finish 25 CRX each year as well simply because of the feed conversion and finish meat yield of the heritage. The chicken eggs/meat I raise fulfill 100% of my protein consumption so it's not a hobby but a way of life.