Hi, I would avoid the C-section if possible also, I have had 2 posterior labours yes they are more painfull but better than a c-section recovery, I have been told that many babies go to that position because they have more room to move, I also think that it delays labour and you may go overdue, but many babies do anyway, only of concern if movement are lessing and you can be monitered if need be.
Best of luck don't rush into anything, a few more days won't hurt....