First, welcome to BYC from someone who also has chickens, ducks and geese!
Was the reference to chicken grit? That helps the birds digest food; actual grits, while made of ground corn, wouldn't be an ideal choice for chickens, in my opinion. Grits would be far from nutritionally complete, and I'm not sure how much processing the corn has to go through.
I have not had much luck with keeping more than one rooster at a time. When there was conflict, I rehomed the more aggressive rooster. He now lives in a rooster flock. Without hens to incite them, roosters can live peacefully with each other.
I rarely say no to getting more chickens, but I don't think that would solve your rooster problem. IF you want to keep both roosters, MAYBE you can house them separately, each with their own group of girls. For a few years, Sir Henry the Loud, a gorgeous Iowa Blue boy, lived in his own coop and run with two hens. Had I let him loose with Billy Boy, a cocky but small Cochin Bantam who "free ranged" with the other hens during the day, there would have been blood.
Best wishes with working out your rooster situation. I, personally, would lean toward keeping John Wayne.