To get right to the point -- I would concentrate your efforts on improving your GMAT score. You really need to break the 700 barrier in order to be competitive at pretty much all of the schools you listed. The exception would be USC. You might think that UCLA cut you a break on your GMAT score, but I believe that Harvard would be more likely to extend a break than UCLA. UCLA has always had a high GMAT score for its ranking. That is a signal that they focus very much on GMAT scores. Of course, you could argue that Harvard has always had a high average GMAT scores well, but that school operates in a different league -- one where every applicant who is admitted will have a very high GMAT score (on average).
Your healthcare industry goals are very logical given your background -- at least from what I can tell based on the preliminary information you have provided. I am curious as to why you do not have Duke and Columbia on your short list of schools. Both the schools out there healthcare strength. I would add the schools you list in order to form a more effective hedging strategy and what I see before me.
For example, UCLA is not very well known for any type of healthcare strength, but Duke is. Both schools share approximately the same ranking. You should take Duke, rather than UCLA. Especially if you do not elect to take your GMAT again.
I hope the above helps.
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