I would strongly advise you to review your essays and resume, and determine where you may be lacking. You may want to consider adding some extra volunteer activities. or pursue some additional leadership roles within your current job; assuming you do not already possess a strong list in these areas.
My GMAT score was not far off from yours, so I surmise that it was not your GMAT that dinged you.
Had applied for Fall 2013 PT evening and GOT dinged
after 6 weeks. Thought had a good chance. Felt the essay and profile was good and interview went well too. GMAT score of 650 could be the only thing, wish they provided feedback. Anyone with re-application experience.
Good luck to others.