with fancy birds they dont like alot of the bigger beans and pulses ,they prefer small maples , mung beans , tares , popcorn maize , paddy rice and wheat and dari and a very small amount of linseed
what brand is your first mix ???? sunflower seeds will put fat on birds hence why there use sparingly in mixes , what type of pigeon are you feeding ???
down to nature they'll naturaly pair when ready thats true in a loft full but not if hens were on there own lol , but as you say have known spare hens to hatch there eggs as long as a cock present
simple maths you say you have 3 cocks one hen and one more sex unknown well as i said if that be a hen you'l have a spare cock plus 2 pairs you could always keep spare cock in another section and after first round split and repair
it takes time to gain the birds confidence then you have to learn a technique where you catch them firm but gentily , rember the birds first thought is there been attacked by a pediter , all movements in a loft should be slow and you should always be calm