Sorry to hear about the dings.
Hard to say what happened based on what you wrote. On the surface there isn't anything that is of major concern, but also there isn't anything that particularly stands out either. Likely you were just a very middle-of-the-road candidate who got lost in the shuffle.
As for the schools you mentioned and your chances, I don't know. Your goals are about as specific as saying "I want a career in business other than banking and consulting". IMD, Tsinghua and MIT are on three separate continents, not to mention INSEAD and Kellogg are pretty different as well. My guess is that your priorities and focus is all over the place (I hesitate to say you are desperate, but that is how you may have come across - a person with no real sense of what he wants who is willing to get in anywhere).
It might be worthwhile to get a ding analysis in your case.
Follow me on Facebook