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45 Verbal is extremely, extremely good. However a 44Q might not be as detrimental as you think it is, unless you're from a non-quantitative background. I'd say, think about your risks and return on the time you're investing into a retake.
A 720 is fantastic! Along with a degree from Harvard and high GPA, your time would be better served with internships, volunteering, and work experience. Just shore up those areas and you should be fine.
Excellent score, just above the Harvard's average one of my friends was accepted to Harvard with 720 and about the similar split of scores. Don't worry. If you are challenged by your Q44 score and you, as I am admire math , than you may try again. I would recommned GC Tests you http://gmatclub.com/tests/ which is best math practice resource.