I may be reading too much into your post, but it seems like the biggest thing you can do is to change your mindset on HOW you convey your candidacy to the adcom.
Remember that since admissions to top schools is so competitive and that there are way more people "on paper" that are qualified than there are actual spots, the admissions process is VERY subjective.
In short, its more akin to dating (woman being the adcom, guy being the applicant) than it is to a guy wanting to buy a new flat screen tv and dutifully laying out a spreadsheet analysis of all the features and pros/cons of each model.
It feels like you're trying way too hard to be "perfect" rather than "compelling" or intriguing. Perfect is impossible (because its subjective), and aiming to be perfect will more likely make you come across as boring.
Again, think about it like dating - its usually how intriguing or compeling that makes someone attractive, and not how "perfect" they are.
And in b-schools, all students are far from perfect, and they didn't get in because the adcom thought they were perfect. Instead, all have their share of flaws, but they were intriguing enough for the adcom to notice.
Thats why don't rewrite the GMAT. The test is about being "good enough", and yours is. Getting a higher score will not improve our chances, and by retaking it, it sends a bad signal to the adcom you don't understand the admissions process or how to market yourself.
Focus on the written applications. You have to convince the adcom why they should pick your Coke over someone else's Pepsi. Just like in any other human behavior where we need to make choices based on subjective preferences, you need to find a way to elicit an emotional response from the adcom. To do that, it's not about listing a bunch of bullet points, but about how you tell YOUR story in a compelling way.
Its just like selling an product. Its not about listing product features,, but about telling a narrative that strikes a chord with a consumer. All cars basically do the same thing and have somewhat similar specs, but each brand elicits a different response (choosing a car brand isn't a rational decision, but an emotional one). A pair of Louboutins, a Tiffany's box, or a LV bag also elicit a certain emotional response over other brands.