Your RFE question is just similar to "demonstrate you are superior to your peers in your area".
Check out the following posts and collect more evidence or any new evidence you have in addition to more recom letters.
Good luck.
http://web.wenxuecity.com/BBSView.php?SubID=immigration&MsgID=100444
http://web.wenxuecity.com/BBSView.php?SubID=immigration&MsgID=99560