I like your story and you seem to understand the role fairly well. But gonna remain negative for now because I have no understanding of your in game play style as XO and no one has vouched for you in that sense yet. I suggest you play XO a bit more, if you really want to show off try and see if the CO of the round will give you some more operational leadership for the round. It'll help your case if you keep a cool head and tick off the boxes you need to show you can handle the role and if you haven't been playing it much, it gives you a idea of the multi-tasking, communication and other skills you need as a Captain.
Good luck on this applicaton.