I'm not sure I haven't had enough experience to tell what mixes are in birds. Very cool though!. I don't know what would be best to feed your birds but I can tell you what I feed my birds. During the summer foraging on about 3acres, and they feed on compost. I just put fruit and vegetable scraps I'm my compost along with egg shells. During the winter they still forage and eat compost but I also supplement with about three large handfulls of scratch grain For 4 hens and 3roosters. One pile of gran per rooster and the hens will eat with the roosters. Rooster will not share one pile .I am also considering the possibility that my birds are overweight. When I got coturnix quail I started keeping 30% protein feed on hand and I started feeding it to all my birds due to the reasonable price I can get it at my local feed store. My games started growing noticeably when I switched over. They may be fat or they may be structurally larger than what they might have been otherwise. I also did the math last night and realized I was feeding them much more than I thought. Therefore I’m going to both cut back portions and switch to lower protein. Then I’ll see if their weight drops or not.
If they are overweight, then I may still be dealing with some line of American game bantam.
They do have good weight around 4lbs for a rooster .. And 2lbs for a hen.