Depending on where you interview, there are a lot of prior military guys that will probably be on your interview panel that will understand the situation. It's not that uncommon. A good buddy of mine, P-3 dude was in the same boat. Solid track record, but he wanted the fun/flying jobs that aren't career builders and thus was shown the door as a non-select for O-4. You'd be crazy not to camp out and bank the separation cash. That said, I know a lot of guys in your shoes that got picked up for SELRES/FTS and promoted there. Look into it if you're interested.