Referring @youmatter:) to the articles
Your success in any application cycle depends on how well you match a school’s metrics profile and the schools where you send your application - your
www.studentdoctor.net
Every application cycle, applicants request expert reviews on the Student Doctor Network to help them assess “What Are My Chances” (WAMC) at getting
www.studentdoctor.net
(I'm confused... are you the OP with a different avatar login? You didn't address my questions.)
What is the nature of your community service (200 hours)? What are you doing? Who benefits and how? What impact is made on the community?
Hours only give me a sense of which applicant pool best fits you, but what your impact was tells me how well you could fit with the brand-name schools. Why should that school take you over someone with more hours? I do not see compelling reasons for Duke, Stanford, or Mayo.