What's your SAT/ACT score? Any subject tests? (Caltech requires Math II and a Science)
Your AP scores are good, and hopefully you only have 3 AP classes prior to senior year since that was all that you were offered? Many other qualified applicants tend to have taken somewhere around 6 to 8 AP classes, but it's fine if you took the maximum difficulty courseload for your school.
Your GPA seems decent, and do you mean "Not released" as in they don't tell you your rank/percentile but they still report it to the schools? Top 6-7% is fine, but keep in mind that tons of people applying are in the top 1% or atleast top 5%.
Honestly, I feel like you lack in ECs. From what I could gather, your ECs consist of band and the Olympiad/Quiz Bowl Events. Saying "Trombone, Competition Marching Band, and District Band" all sort of seem to fit into one major focus of yours. It's good that you have a passion for music/band, but this really seems to be your only actual EC. This is a very generic activity and won't help you to stand out in any significant way, but it's fine nonetheless. The olympiad stuff for a couple years is ok, but with no awards/medals it doesn't make much a difference. Neither does the 'Quiz Bowl' event really stand out.
Your work in a research lab sounds promising, however you'd need to make it a little more clear as to what your role was exactly. Also, they won't really care too much about you currently writing a paper and doing after school research since nothing has been published or verified etc.
I honestly don't feel like your chances are too good for Stanford or Caltech, but that doesn't mean you don't have a chance. Good luck!