Academia is a very exclusive club indeed, and it is true that they tend to be most impressed with high scores, top schools and good grades when it comes time to go for the PhD. Your credentials are good, but not great, so I see your dilemma. Make sure you emphasize your published work, which is great evidence of career academic potential. If you don't feel you can boost your GMAT, then you might try to play the game a bit and target schools which are growing their PhD programs. Google it and go on blogs and you may be able to find out which schools are expanding in this area. For example, I know that GA Tech in Atlanta accepted a high number of PhD applicants last year because they received some funding to expand their PhD program in MGT. Good luck.
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