Congrats on your accomplishments! I think your application will be strong as-is and, given your disdain for standardized testing I PROBABLY would not bother re-taking even though you score is on the low side for Brown. If you can stand to retake it then it couldn’t hurt and could help a small amount, but it really depends on how miserable it would be for your to retake it.
How’s your (approximate) class rank? Your class is small - is it a very competitive school? While Brown CDS shows that 92 percent of their admitted students are in the top 10 percent of their high school class, only 28 percent of students submitted rank, so it’s not all that telling. Anyway nothing you can do about that…your rank is what it is.
Overall you have a great application and are competitive. Congrats. Having said that, most people with competitive applications don’t get in (sorry!). So, great job, make sure you have some targets and likelies, and good luck to you!