Once you've hit the 80% in quant there is NOTHING you have to worry about. That GMAT score will not keep you out of any school in the entire world. So congrats on your 730, and good luck with your applications!
No one is EVER 100% satisfied with there score. I bet if someone told you the day before the test you'd get a 730 with a Q48 V42, you'd be super happy with that score. The GMAT is addicting, especially if you even felt you left 10 points on the table, MAYBE.
Don't consider a retake for 1 second... it's a waste of your time and resources, and the GMAT is only one part of your application. Start improving EVERYTHING else, the GMAT is solid.
WIth the top 15 schools all having average GMAT's of above 700, you can see that the GMAT only plays a small role once you've hit that level. There are many people with below a 730 that get into Harvard, Stanford, and Wharton... what makes them special is the rest of your application. So it's time to move on
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