A few things come to mind when I see “premed”.
One is that there are a huge number of universities which are very good for premed students. Given your exceptional academics up to now, you should be able to find solid safeties that would be very good choices. Your list of reaches are all also good choices for a premed student (assuming that finances are okay).
Also, medical school is expensive. If you are full pay at most of the schools on your list, and if you end up in medical school then the total cost of 8 years of university could very well be somewhere around about $900,000. I do know a small number of parents who could handle this with no debt and no major discomfort, but only a small number. If you are serious about premed, then you should budget for a full 8 years of university. It is also not clear that attending an expensive university (compared to an in-state public school, or a school that provides merit aid) is going to make a difference one way or the other in terms of impacting your chances of being accepted to medical school.
The third thing that comes to mind is that most students who start university thinking “premed” end up doing something else. This is okay. There are lots of other options that make a lot of sense for many, many students. Some end up in medical related careers (such as biotech). Some end up doing something very different (law, computer science, …). Fortunately given that most universities are very good for premed students and are also very good for a wide range of other options, you will have plenty of time to figure this out.
I tend to say “you should budget for eight years” on the basis that you do not want finances to make medical school impractical. In the relatively likely case that you end up doing something else, the extra room in the budget is likely to end up being useful one way or another.
Writing well is a significant advantage in a very wide range of careers. For someone who works in computer science, or mathematics, or biotech, or law, or any one of a rather wide range of other areas being able to write well can be very helpful on the job. This should help you one way or another regardless of which career you end up with.
Looking at your excellent academic results up to now, the next thing that comes to mind is that you are a competitive applicant for any university in the US (not including very special purpose schools such as music conservatories). However, somewhere between 80% and 85% of applicants are competitive for the top universities in the US, such as your list of reaches. Thus you can’t do much more than apply and see what happens.
Your list of ECs is long. I find it hard to understand how you manage to do so much. I do understand that people vary in terms of how busy they like to keep themselves.
I see small schools (Williams, Amherst) on your list, and large schools (U.Michigan). You might want to think about which would be a good fit for you. You can do well with a degree from either a small or a large school, but finding a good fit is worth the effort. Your explanation of why you like Brown makes a lot of sense to me. It would not shock me if you are “one and done” quickly with an acceptance to Brown ED, but of course you cannot count on this.
Perhaps the three most important schools for you to think about are your ED school and your two safeties. You should make sure that you apply to at least one and preferably two safeties that you would be happy attending.
And I think that you are doing very well.