You should increase your acreage or choose something more resistant to grazing. I'm sure you were excited to your plot eaten to the ground, but it isn't a good thing to have your plots eaten that low.
I like 5 acres minimum for most beans, but cowpeas (purple hull, iron clay) or forage soybeans might get by with half that depending on the deer density.
One good choice that lots of people overlook is aeschynomene (joint vetch, deer vetch). It's a summer annual that takes grazing pressure better than any bean.