I also booked at 180 days out and could not get a decent time for Le Cellier. We really did not want to eat at 8:50. As it turned out, I called exactly at 9:00 a.m. the first day you were able to book the Candlelight Processional dinner package and was able to get a good ADR at Le Cellier then.
I would start making my ADR's ASAP if I were you. Also, I think your chances of renting a DVC accommodation at this late date for that time are very slim. I made my ressies exactly at 11 months out, day by day, for my Boardwalk view villa and phone lines were quite busy every morning. Of course you won't know until you try, but I wouldn't cancel my 40% off deal just yet if I were you.