This might be it. Granted I haven't been chosen as a finalist, but have rushed squadrons and got invited to interview. I've been to rush events with other candidates and could just see how some of them don't hit it off or are just pricks to other rushees. One guy stands out in mind, I would be having a conversation and the guy would just cut in and interrupt me, downplaying me because I'm off the street. "Yeah well I'm a blackhawk mechanic, so I understand service unlike off the street guys". One senior loadmaster saw what was going on and told the dude to go talk to a Colonel who was plastered and then he joined me to finish up our conversation. Didn't see the dude at interviews.
Also be genuine and try to get to know them, I feel these guys can spot brownnosers well. I also saw it as trying to figure out if I would enjoy being around them for 10+ years. It works both ways, you're also in a way interviewing them too.
I would look into bumping your scores. Last heavy unit I talked to, had a 90 pilot score cutoff. You mention issues with trying to take AFOQT and TBAS. I was 31 when I took my tests, I had to call every ROTC and AF recruiter down the coast to give me a chance to take the tests. I wasn't the only one, when I talked to other interview candidates they had the same experiences, think of it as a rite of passage 🙂