It's always tricky to find the system that works for you. I have always wondered about the treadle feeders but the cost kept me away.
I have a feeling you could modify it to make it suit your needs better.
For example if you want to keep them from standing on top, maybe put a dome lid on top? Or...
Can you post a picture of the feeders
Edit I think I know the ones you are talking about.
It's the type with the step that opens the lid right?
You should return them and get your $ back.
I honestly just use the hog pans from TSC. They cost $3-$5 each and I just put a little scoop of food in...