Your stats are phenomenal. Stop worrying about them. Now you need to work on the rest of the application. Make sure you present yourself as someone who admissions would want on their campus. That is often what students with great score/grades forget. Adcoms are looking for good kids. Kids who will be a friend to others, kids who will add to the campus community by being a nice person and enriching life on campus by the things you will get involved with. Your letters of rec and essays should reflect who you are in this regard, not just talk about how smart you are and how good your scores are. And by all means, if Brown is your first choice you should apply early. Not only will your college application process end early (should you get in), but it signifies to Brown that it TRULY IS your FIRST CHOICE. That is where the advantage comes from. They know you will matriculate if accepted
How many letters of recs would I be able to send? For supplemental recs for PLME would it be better to have a doctor/researcher or a volunteer director? Could I send three teacher recs and a supplemental? I was thinking of asking comp sci, bio, and english teachers