I would suggest you to retake the GMAT. Now I am regretting that I did not retake it. My GAMT score is 710 too, but I only got admitted in a ~50 business school. For your infomation, I also applied one top 5, one top 10, and one top 20 school. At that time, I did believe that I can get an offer from the top 20 school at least. BTW, I have Ph.D. degree in the USA. Remember, as other people said, you are competing with the other Chinese candidates having GMAT 750+.