Any pictures of your feeder? I hate the commercial feeders, too. My 20 chicks make such a mess, and waste so much food!
Ha! Funny you should ask. Here is a link to a video that shows the feeders we made and is about scratch grains. Double whammy. It isn't the most exciting video, and is probably a little too long ... I'm making the sniffing noises into the iPhone (sorry!) ...
We have several of these feed station throughout the coop because we have so many birds and I want to make sure the meanies aren't keeping the others from eating. That said, they tend to favor one feeder, the one closest to the door to the pasture.
I think for ducks I'll make a trough version of these feeders, meaning one large opening along the top side of the pipe. I think I prefer the plastic to metal alternatives as theoretically the plastic would work a bit better for fermented feed if I should ever decide to start feeding that, but the metal gutter version of this feeder would maybe be a little less work as sawing through this pipe and then sanding the edges took me a long time.