Great job at doing so well at your super competitive school! I think your scores are fine for any school. For your extracurriculars, I think leading your school’s fencing team to nationals is pretty awesome. Do you have other similar achievements with fencing, either by yourself or as a team? ECs are great when they are clustered into your interest areas; maybe you can expand on your Club Épée team even more to showcase your passion.
I think perhaps the biggest problem you will face is not something in your control: other competitive people applying from your school. Keep in mind in some cases, adcoms view the entire applicant pool from one high school, especially ultra competitive ones. This was how some Thomas Jefferson kids were rejected from MIT a few years back; they were qualified, but not as qualified as their peers in their class.
My thread: http://talk.collegeconfidential.com/what-my-chances/1780881-princeton-scea-chances.html#latest