I am actually a 5th time applicant. I really don't know why I haven't been accepted yet, I've gotten interviews and been on waitlists...the process has been overall quite heartbreaking but I am really determined. I have my masters in public health genetics as well. Last years after I didn't get into a program I accepted a GCA position so I'm hoping that helps me out a little bit. I say all that to say, don't be discouraged if this is what you really want.