Warning: Long Post
Like all previously said before, Academy admission isn't easy. From all that I've learned and from talking with my BGO I have learned this. Some people get in with extra-ordinary skills, and they are your typical "achiever" person. They are captain of like 3 varsity sports, their parents are retired military officers (or Academy grads) , they have had all A's since middle school, their SATs are over 1500, and they have more than 500 hours of community service. These are only one piece of the story. There are also the other people who get appointments, who aren't the highest achievers. Everyone has a story, and the Academy will listen to everyone's. I'm sure you know now that nothing is "secured". Many people applying to the Academies are doing so because their parents are in the military. I wouldn't be surprised if that's the majority of people applying.
Second, attending a top tier school is great, but isn't what you want to shoot for as a point in any future interviews. In your future interviews I'd say that as you should bring up you are in a great school, say what you've done to realize your position in society as a top tier school student and how being a Naval Officer will help you be a better person.
Third. PLEASE DO NOT rely only on Presidential! Apply for as much as you can, you sound like you qualify for many others.
Fourth, you said something about probably dropping USNA to to stay at UVA. Honestly, I would really not do that. For some people, the Naval Academy is where they see themselves and they are trying their hardest to get there. Not everyone has all the credentials that other applicants have, so the biggest part of their application is their motivation for wanting to go to the USNA and STAY there. In the end of the day, for anything you want to do, you have to have the motivation to do it. Think about it. One could be a star student, with everything perfect and maxed out and you're just an LOA candidate because you're that great, but then after two years you quit and leave the Academy while someone else who probably barely made it in, had to scrape for everything they had and finally made it to the Academy without the highest qualifications actually stays until Commissioning day.
What is my point. Before interviews, please actually consider if USNA is a place you want to go and STAY at, because for many people USNA is the only place they know they want to go. Second, if you still are having the USNA/UVA split, then do not make that clear during your future interviews. Especially your BGO one. Commitment is key, and if you sound like you're going to waste the Academy's money by going in and dropping out, your BGO and other interviewers could pick up on it. So as a key of advice, I'd say not to bring up UVA at all, unless if you're asked about your current attendance to it, or if asked about a Plan B.
Fifth and final thing, you sound like you have achieved a lot. That is good, but in future interviews you will have, let those achievements speak for themselves most of the time unless if directly asked about what you've done or something relates to it. Focus more on your commitment to the Academy and what you have done/will do to help make the society you live in/and will go to, better. Cause without your commitment, you will not last 4 years at the Academy. It's taxing, and stressful, and an environment where, if you do not want to be there, you will not make it.
Congressman/Senator nominations process has started for most Senators/Congressman. Look for yours online at the senate websites. There should be a link to it on the Academy page.
You are a student already at UVA so again look at the NROTC path if you're already there. And again I will reiterate, please find out if you want to go to the Academy. There are many ways to get commissioned, and the Academy is NOT the only way. But if you are going to do it, please be committed, and motivated to do so.
Wishing you the best.