ebms99:
Great profile! Regarding your two major points:
(1) GPA is calibrated based on a variety of factors including the school from which you received your degree. If the school does in fact have a negative curve (or something like it) then the AdComs at these b-schools on your list will know of it. I'm not terribly aware of whether your GPA is suitable or not, but we can check that out for you as a client and make sure it's appropriately evaluated relative to traditional US feeder schools. Your GMAT score of 730 should be a good indication of your academic abilities. I don't think it's a huge deal.
(2) That your profile is different is a huge advantage. Many of the consulting/banking/tech candidates would love to have a differentiated profile. It's much harder to compete when you are coming from those cohorts. You should absolutely lean into CPG as your calling card. You need to pitch yourself as the "expert" in all things CPG.
It sounds like the four schools on your list are within reach. HBS will be particularly tough to gain admission just given the sheer level of competition. You might want to consider Columbia Early Decision to give yourself a slight edge. Kellogg honestly sounds like the best fit for Brand Management and Marketing for CPG.
Please reach out to us if you are interested in talking more and want to discuss our services and how we can help you craft this narrative to fit these excellent schools on your radar.
https://admissionado.com/free-consultation/