Another point, is you are overfeeding. I did this when I first started. When chickens are over fed, and you bring them food, they still act all excited, and race to check it out, but they leave a lot of it, it gets trampled into the soil, and begins to rot, mold and stink.
I went to feeding in flat dishes, but I check it each night, if it is empty, I feed a little more, if there is left over, I feed a little less. One would think that eventually you would get an exact amount, but really it varies quite a bit.
This keeps all the feed cleaned up. And the mold, and stink is not an issue. It saves a lot of money too, as wasted feed is expensive.
Mrs K