Thanks for sharing this information, and sorry that you did not score where you wanted on the GMAT. With this score (though it really depends a lot on the rest of your profile. Your professional experience sounds quite technical, though quite interesting/unique, and I'm not sure about your extracurricular/community profile), I'd say that ISB and NUS would be reaches, but I should caveat by saying that I'm not as familiar with some of the programs on your list.
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