@telheo, a 4.0 GPA/valedictorian status and 2400 super-scored AP don’t guarantee much of anything. Nor do 5 on 5 APs, or your SAT II’s. Consider this applicant from last year:
That poster was an Asian male STEM applicant from California, a terrible demographic group. Unlike you, he had no hook. But he was at least as qualified as you are in terms of academic and extra-curricular accomplishments, probably more so.
I agree that elite schools prefer depth and accomplishment in a few ECs to superficial participation in many. However, I fail to quite see how you have achieved that:
- Music seems to be your main EC. Mostly jazz band related activities for the past 4 years. You mention 14 years of violin, but other than lessons it doesn't seem to be a major factor for you. Is that correct? Your music is a solid EC, but not more than that. There are applicants who are conservatory level musicians. There are people with superior musical backgrounds who leave them off their list of ECs altogether, because they don't want to send a confusing message.
- You seem to be involved with your youth group and synagogue, but not to an unusual extent.
- Beyond that, I see a hodgepodge of superficial or limited activities: a summer camp counselor here, a 10th grade social justice program there, a couple of trips to Europe (nice if your parents can afford it), and the ubiquitous NHS. I fail to see how this qualifies as "I pour my time heavily into specific areas". You certainly don't need to spread out more, but I don't see much depth or level of achievement, and I don't see a coherent set of interests.
You need to work hard to paint a picture of yourself as someone who brings different something to elite schools and who has a coherent focus and direction that will allow him to make good use of the incredible resources available at such schools. What do you want to study? What is your long term focus? What matters to you? What makes you stand out as a person? Right now I don’t get much sense of these things.
I would agree with @Falcon1’s assessment. I don’t mean to demean your accomplishments. I am sure you are bright and have worked hard, and your legacy card may well get you in; but otherwise I would tend to say that you are one of the many bright and talented young people who would probably get buried in the avalanche of similar applicants. If you do get in, count your blessings, be humble about it, and make the most of your opportunity. If not, remember that the world doesn’t hinge on acceptance to Harvard.