If you moved the roller closer to the frame rail the chain would be further from the swingarm and less likely to hit frame rail.Looked again.Cant move it enough that way either.You could just make a chain slide for right on that frame member and get rid of the roller.
Funny my bike hit that brace when it was new,13th sprocket..14 made it worse,i put on a new roller..that helped a lot.but still slight hit. It would be nice to just get rid of that roller and make a proctor for the frame,something for the front of it,not something that goes over it makeing thicker.