To be honest, I want to try Iowa Blues, because coopers hawks are big enough to be tough and small enough to be swift, unlike a big ol' slow red-tail or a little bitty sharp shinned hawk, and it takes a chicken with enough muscle, brains, and speed to deal with cooper's, and more bankavoid type...
The cooper's have been horrendous on this side of town too, I lost a d'uccle, an old english game bantam, and several cochin mixed pullets to one particular larger-ish adult female cooper's hawk.
Hey, if you are still having issues with feed, I work at the Olsen's right there across from Mortimer's (you know where I'm talking) and I've heard great reviews about the Don Roberto's El Cantacor feed. It's a mix of grains, peas, sunflower seeds, and mineral and vitamin pellets, my hens love...