Jessica,I use this one and it's fantastic for Scratch and Peck. To get more feed to come down, they are forced to eat all the small stuff too, instead of just pecking for all the good stuff and leaving what they don't like.
I use that one too. Now I haven't paid much attention but many times it will just be all the powder in the bowl, no grains. Have you noticed that yours are eating the powder? I usually shake it a bit to get the grains to fall down each time I go out to coop. Maybe I should just leave it alone?