I am reassured that you'll be developing your ECs over the next 1.5 years or so, which has a better chance of resulting in a solid application more likely to appeal to a broad range of schools.
High school activities are not generally included on a med school application unless the activity continued into the college years. Is there any chance you could resume the HS activity over breaks when you're home?
With the planned shadowing, 1.5 years+ of clinical experience, 2+ years of research and a publication, with the leadership and teaching/mentoring you describe, and some additional nonmedical, noncampus community service, I think you'll be in good shape.