Have you visited these schools? I would not apply ED unless you have a clear first choice school, and it doesn’t sound as if you do. Duke has a lot of energy regarding sports. Brown…not so much. I would really think about what you want.
Your grades and test scores are excellent. Most will have taken calc BC- not sure how much this will matter, but I would not worry about it.
Your ECs are good! They show you were a busy and involved HS student. Will there be students with higher level awards and ECs? Yes, but do not worry. You be you.
Hopefully your LORs will be detailed, they will show how you stood out in class, etc. Teachers in our HS will write that this is the best student they have ever had in their 15+ years of teaching, and then go on to explain why. Right now you do not know much about your letters, and there is not much you can do about it. Again, make an appropriate list and do not worry.
You have/had total control over your essays. Take advantage of this!
When we visited Duke there was a parent who raised her hand and asked this question: “How can you expect students to have top grades and rigor, and also expect them to do all of these activities where they stand out?” The response- “That’s what we expect.”
We visited Rochester and our tour guide told us that he was struggling with a math problem. He wrote it on the board in the library and jokingly wrote “help.” He stepped away to use the bathroom and when he returned, somebody solved the problem and also wrote a detailed explanation. He went on to say that this was typical of Rochester.
Pitt blew me away. My daughter interviewed for something there and the honors students were some of the most accomplished kids I have ever met.
You are an exceptional student and many schools will be happy to have you. But…chancing you for Brown and Duke is impossible due to the high number of students who are also exceptional. Choose safeties that you love and I have no doubt that you will thrive.