Hello. Welcome to PT. I am glad to hear of your success. The only fly predators here in Cali. that i can remember are the fly catcher bird, humming birds, any of the ground feeding birds that scratch the ground, the robber fly that looks like a giant fly that eats flies. And keeping the cats out of the yard in the day time so all these birds can do their thing is the key factor. What about D.E.. That can be put over the dung piles to control the flies. I have zero experience with it but one day, I wish to make a setup with window screens that can be put over the bait; the screen box will have D.E. stuck to it and when the flies try to get to the bait they get cut up.