No GPA ‘threshold’ at highly selective private U’s. I can assure you of that. Maybe at flagship state U’s, but not at highly selective private U’s which look at the entire picture. My kid is not an URM. His excellent public school doesn’t calculate UW GPA, nor does it rank, but I tried to calculate his UW GPA just out of curiosity, and I think it was a 3.6. Weighted was 4.18/4.4 max. Probably top 5% of his class based on weighted GPA. Had other evidence of unusually high achievement in an extracurricular. Got into a tippy-top school. Only two others from his school in past 15 or more years had gotten into this school, and both had higher GPAs than he did.
If you feel that your guidance counselor doesn’t like you, and thinks that you are a grade grubber, maybe she shouldn’t be the one writing your guidance rec. The particulars of how GPA and class rank would be calculated should have been made crystal clear to everyone. You shouldn’t have had to ask, and certainly, your having asked should not be held against you. I have heard of exceptionally high-achieving students getting the principal to write their guidance recommendation. You sound like an unusually high-achieving student for your school, what with being the only one taking dual enrollment classes. Maybe this would be appropriate, in your situation. Just the fact that the principal is writing the student’s guidance recommendation, rather than a counselor, is a strong statement in and of itself.
Don’t count on ADHD medication being the cure-all for your attention and executive functioning issues. I would say that at least half the high schoolers for whom I’ve prescribed it, had issues with it. For some kids, it’s amazing. They literally go from D students to A students, because no matter how hard they tried, they just couldn’t focus on and absorb the material without the medication. But for others, the side effects were untenable, or they felt zombified on the med, and really didn’t absorb the material well, even though they could stay focused on it. Many required medication dosage adjustments and medication changes. It is often not a case of finding the right medication/dose quickly and easily, with the first try. I’m not trying to discourage you from trying medication - if you have ADHD, you definitely should try it. I’m just saying don’t count on it working for you. Count on the drive and determination that you have shown thus far, and if ADHD medication helps, it’s a bonus for you.
It’s obvious from your writing that you are very bright. But (please don’t take offense), I also see issues with your writing. Sometimes your writing does not clearly express to the reader what you are trying to say. There are mechanical issues, too. So make sure that the English teacher with whom you have a good relationship carefully proofreads every word of your applications - EVERY WORD.
I really do think that you have a shot at getting into one, several, or even all of your reaches. The class rank is good enough. ACT is great. Your EC’s sound interesting. I have no idea how you can find out what kind of a letter your guidance counselor intends to write, but it is important that every letter of recommendation say that you are remarkable. The highly selective private schools definitely give weight to recommendations, and if there’s anything unfavorable, or if they damn you with faint praise, it will hurt your chances. One of my son’s teachers took so long to write his letter that we were getting worried. She said, “I am taking extra care with this letter, because I want to be sure to get it just right. I know how much is riding on it.” You want letters from teachers who feel that way about you.