we ended up putting a roof over the run to help keep it drier. The flies and stink were awful. And since my neighbors are really really close I had to do something. The DE didnt do much at all. I ended up getting Golden Marlin and setting up bait stations for the flies. Worked like a charm. Just have to make sure the chickens or any other animals you love away from it.
Now any time the flies start looking like they are getting out of control I put out the bait. Got a big thing of it at Agway.
I tried those fly bait bags,, but ewwww gross. And with my luck a fly strip thing would end up stuck to a cat, or one of the resident squirrels. While that would be kinda funny. It would also suck.