I understand your situation. I have known two students who were in the same type of district and with the same dilemma as you. They both wanted to go to USNA as their first choice, but they also were interested in a second academy. Their highest priority was to serve their country, and they could have been happy working in either of the two services they were considering. A USNA congressional nomination was a much more difficult nomination to receive in their districts due to the high number of applications submitted versus the other academies.
In the end, one student decided he really wanted to go to USNA more, so he ranked USNA first for all his nom applications. In his case, there were a couple of extra aspects of his package that made him stand out to the nomination committees, and that helped him significantly. He received a USNA nomination and subsequently an appointment, and that is where he is now.
The other student decided to split his requests. He ranked USMA first for his representative and USNA first for his two senators. This kid was a great candidate, but he didn’t have anything extra special that made him stand out to the committee compared to all the other awesome candidates in his district. Because of this, he was worried that if he ranked USNA first for all the applications, he might not receive a nomination at all. After the dust settled, he ended up getting a USMA nom from his representative, and no USNA nom from any other source. He is at USMA currently and is very happy.
So my question to you is: Which one of those are you?
But for you, there is another factor. You already have a presidential nomination to both academies. Granted they don’t award a tremendous number of appointments for this type of nom, but a nomination is a nomination, so you have that advantage.