Mine also do not overeat. Their feed is grains with a vitamin mix (Scratch & Peck), which is available all day. I have to keep them in the run for a half hour in the morning to make sure they eat; otherwise, they'd run right out.
I fill their feeder 3 times a day, and there's always some left at bedtime.
I fill their feeder 3 times a day, and there's always some left at bedtime.