Based on what you present here, I would say that you are "competitive" at H/S/W and with a strong application would be "more than competitive". You have to remember that the candidates who are applying to these caliber programs are the best in the world all of whom have amazing credentials so you need to distinguish yourself from the best of the best. To best improve your chances at these programs, I would recommend that you apply R2 and that you really focus on your international career -- as this is one of the experiences that admissions values the most.
The one concern about your candidacy is lack of extracurricular activities/community service. To be direct, it is not as competitive as the candidates who I have seen interviewed/admitted R1. This factor can be slightly diminished if in the essays you can speak about what you will participate in at school and further in your career. While not ideal, I do not view it as a death sentence for the top programs.
As for your backup schools, with a strong application and a good interview, you would be a "extremely competitive" at these schools.
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