I think you are obsessed with GMAT now (as you call yourself "gmatlover12 ")....
Anyways, if I could sum up of what have you done with your obsession: Human wants are unlimited, but the means to satisfy human wants are limited.
If the want is to get into the best B-School in the world, i.e. any of the top 5, a score of 770 is a highly respected score and should help you get over the line. A perfect score of 800 does not guarantee admission in a top 5 B-School but an overall strong application packet with a score of 770 should help in getting the job done.
Rest I feel a person, who cancels a score of 750 and also a score of 770 on GMAT, should not ask such a question in this forum and "seek public opinion" whether what he has done is right or wrong? I think a person with such capabilities generally knows what he/she is doing with his/her life? As I said earlier you have limited means. What you want to do with "your time" is totally your decision.
Anyways, I wish you all the very best for your life and posting a long debrief. I have picked up some useful tips from your post!