From my experience (applied this cycle as well), 2 things seemed to matter the most:
1) FIT
2) Research experience.
Based on your publication records, it sounds like you're doing more than just data entry, and your research experience is significant despite being out of school for "only" a year. If you didn't get as many interviews as you liked, you may want to check over your SOP and CV. I was shocked to see the subpar, amateur CVs for some people interviewing at my lab. Your CV is pretty much you in a couple pages. Make it professional, and make sure it truly showcases your work.
If you DID get interviews and was rejected thereafter, I would say the biggest factor is fit. Fit, in my opinion, is more than wanting to do what your PI does. While some may disagree, and I have no doubt many people have gained acceptance to top programs without similar experience to the field they're applying to, but I almost everyone I spoke to on interviews, and all students invited to interview for a position at my lab had experience in the same field. It may not be the exact same thing, but most people applying for PTSD labs had PTSD experience. People applying to heavy neuroimagers had at least operated a scanner before. It was pretty shocking for me upon realizing this, since my whole lab told me that it's the research experience that matters, not necessarily which field (pshh).
Furthermore, at one particular school, I got some very very detailed questions about my field of study. It would've been virtually impossible for me to articulate my answers if I didn't have the experience I have.
Sorry this cycle didn't turn out well for you, but on the bright side, you're below the average age of matriculants and already have some pretty awesome experience.
Also, as the previous poster said, numbers really don't matter that much. They will only get you so far.