I think based on your practice scores you can definitely score around 720 on the real thing possibly even higher. My score was 20 points higher than my highest practice score actually. If you can score 700+ on
MGMAT for sure you can score that high on the real thing provided you don't choke or get unlucky on the test day, which is probably what happened to you. I would definitely take another month to look over materials again, and retake in a month because you don't want to take too long off. GOOD LUCK!
PS. actually got same scores 49Q 31V first time lol which was a 660 at the time /shrug.