You could try portion feeding. What you do is feed 3/4s of what the daily recommended amount is. They should clean this up by the afternoon. In the afternoon feed the rest of the days food. If they clean it up before they roost adjust the next afternoons feeding with a little more, if they leave some next afternoon a little less. By watching how much they eat to clean it up with say only a bit left you will find out how much to put in the feeder each morning. Should work on most any flock. That way you don't have to know the average LF eats 1/4 lbs. a day. You know how much your flock eats. Just check once and a while to see how soon they clean the feeder out, adjustments may be needed.