Come on Brother... that's a score I will kill for

.
No matter how good you would have paced, the point difference could not have been a +10 or +20.
A 750 or 770 is pretty much the same if your other aspects of the application are as good. So just cheer up and enjoy your score. Its a DAMN good score. If you still get dinged at any school, god forbidding

, you can be rest assured that it definitely is not because of your 750.
If a 750 cant get you through, a 770 would either!!!

Chill out man.
Congratulations!!!!!