Planting an eroding hillside.

Hello friends. Two acres of my homestead is a sloping red clay disaster for farming. To combat the erosion I've built hugel-Swales and terraces. The ones I've completed are thriving with beautiful growth. The rest is eroding faster than I can deal with. I planted cowpeas which grew well until a heaving rain. Now they're covered. The same with my winter rye. I have fifteen other acres so I feel as if I'm wasting my time fighting this. What I'm thinking about is planting robust growers in diagonal rows in the clay. I'm experienced in growing sunchokes, horseradish, Egyptian onions, and garlic. These are the plants I'm thinking of planting and letting them go wild. They should grow and we should have a large amount to sell. Plus no more watching my work wash away. Can you guys think of any other plants I can use in this situation?
As always, many thanks to you all. This forum has changed my life.

Hi Scott! I think the American Beauties Native Plant Database and the Plants For a Future Database will be useful for finding a lot of ideas on what to plant and increase biodiversity.