Yes. PDs are going to be a much more valuable source of information and assistance than the PC.
My thoughts are that some programs simply do not give ANY positions outside of the match regardless of whether or not they have interviewed someone previously. There are NRMP rules about this and some do not wish to even deal with figuring out whether ot not they can offer such positions.
Others will wish to wait and see what the competition is like during the next match. That is, you may have been competitive enough to interview THIS year, but next year is a whole new crowd of applicants and you may not look as good compared to them.
You will never know unless you ask.
You need to tell everyone you know (outside of SDN) that you are in the market for a position, ANYWHERE (you cannot be picky at this time), register for FindAResident, check other BBs, your home program, etc. Anyone and anywhere.