We had trouble booking at 180 for this November.
We had reservations in February 2018 - I booked right at 180 days (our stay starts on a Sunday) and the earliest time I could get was 12:00...we wanted 10:00....we took what we could get and loved the brunch.
Keep checking everyday or use touringplans to search for you
FWIW...It seems that there is another wave of openings that appear around 100-120 days...not sure if its really a WDW thing or just a lot of people cancel at that point.
Good luck to you!