What
@subreservist said is accurate. I was selected my second time around, both boards the selection rate was below 9%. You have to understand that EVERYONE applying is overqualified. It also depends on what the board is looking for. The year I was selected the board was targeting people with an acquisition background and there were a lot of public sector acquisition professionals (1102s) selected (I am not an 1102).
Is it worth it to apply again? I mean, that is up for you to decide. As far as making your package more attractive, there are several things you can do. You can quantify everything in your resume (# of people managed, how large of a budget have you managed, size of projects, etc.). You mentioned you did interviews with a CAPT and two CDRs. Where they SELRES SUPPOs or FTS? Make sure whoever is doing your interview is SELRES SUPPOs, the higher the better so target O6s. Chances are the board members may know who those CAPTs are and their opinion carries weight.
Expected 4-8 weeks before your OR has the results. Only the OR will have the results, they will not be posted online. The result will either be a Yes or a No, no feedback provided. Keep pushing.