SAT is obviously phenomenal. The 100+ hours for tutoring represents what span of time? (I.e. 100 over your four years of high school, this year, this month, etc.) Table tennis sounds fun! I agree that your UW GPA may be cause for concern… I believe that guidance counselors report percentiles, even if your school doesn’t technically rank, so Stanford will know what the number means for your school. “Meh” essays also seem a bit concerning for a school so concerned with fit & “intellectual vitality.” I don’t think your hook is actually a hook, especially for Stanford. I can see it going either way at this point – if I had to guess, maybe a waitlist? – but I’m sure you’ll be accepted to many top schools.
Best of luck! 
Chance me back? http://talk.qa.collegeconfidential.com/what-my-chances/1966406-chance-me-upenn-ed-yale-brown-princeton-etc-will-chance-back-p1.html