In my area, western oregon, I use helical concaves oin everything. Clovers, grasses, and small grains. I sold my Gorden harvesting helicals because they dont have wires and for the smaller seed stuff, I wanted wires, even though the non wire helicals worked. They just let too many long straws through. Now I run Lowen helicals with small wires. I also made my own set of helical grates which work excellent.