Sooo everything looks in order, and you have a good GMAT, and a solid career behind you. The question you need to work on most is: What makes me H/S/W material? i.e. how can you SHOW them. the Libya stuff is a good example, cause it REALLY is unique, and I would play heavy on that. But it also needs to come from a Professional side. As for PE/VC, keep in mind that thy are the MOST sought after posts, and that there are few of them, so depending upon your past experience (which we need to see more in detail) you might want to tweak your goals a bit. Other than that, yes 20 or 40 more points on the GMAT will make a difference in your case, so if you believe you can test higher, I would go for it.
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