I went to a machine shop today and talked to them about getting this part machined. They said I should just run it as is. The new band has the same type of grooves in it. He said that if he machined it flat again that because of the grain structure of the steel it would cause the band and carrier to wear quickly again and probably have a similar grooved surface. Because the current grain structure of the steel is already changed the new band and old drum wont wear nearly as bad together. So I am going to leave the reaction carrier as is.