at this stage i also feed once a day while on the dark, my ybs are exercised once a day also at this stage........once you have a certain routine sorted out let the ybs out and feed them the full amount once they trap, this will give them 24 hours to digest the food and will mean they will trap the day after.
you also have to get the feed right, and the amount right.......i feed 50%widowhood mix and also a diet mix of 50% which is a high energy mix but digests through them very quickly, as a rough guide i feed 1 oz per bird, but some feed until maybe 3 or 4 birds go to the drinkers, then remove the corn......
once i start training my routine changes........