Current PCSM isn't incredible, I know multiple people with similar hours, lower scores and a higher PCSM.
BUT, thankfully a lot of guard units look at your 201+ more than the current PCSM.
Like ryleypav said, if you are getting interviews, you are on the right track. It just sounds like you weren't comfortable during your interview. You should be prepared for you answer, but besides the "about me", it might be better to have an idea of the high points you want to hit in your answer rather than something memorized.
If you are really worried, it might be useful to do Bogidope or another company's interview prep. You are on the right track, most people don't get hired on their first interview, so just use that experience going forward.