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Re: Profile Evaluation: OB/Management
you're interests seem more aligned with strategic management as a sub-discipline. leadership in macro-research is more or less focused on Board of Directors, CEOs, and Top Management Teams. This coupled with your interests in M&A would put you in the strategy world, more so than the OB world. If you wish to get some training on both sides, look for programs that may be fairly solid in both strategy and OB.
On the surface level, your GPA will be the hurdle may knock you out of different programs. I personally think that this will need to be explicitly addressed in your SOP. Not that this is 'fair' in assessing candidates, but I think through experience adcoms have learned that GPA is a fairly solid indicator overall and special situations exist, but are not that common. A very high GMAT score is something that may help the committee assess your 'academic aptitude' to handle doctoral training.
Don't bank on a specific university granting you admissions (i.e., Purdue/Indiana). I would definitely increase the number of schools plan to apply to closer to 25-35 range, if not more. Try reaching out to doctoral program directors ahead of time and let them know you are interested in the program, and see what are the things they are looking for and ask them what you can do to be more competitive. This may help signal interest to the department.
Best of luck!