As above, the 2 easiest to book will be your home resorts. You will be very unlikely to find consecutive days at any other resort at the 7 month mark.
If I were you, I would book your home at 11 months, possibly in separate reservations depending on how long you plan to stay, and then stalk like crazy at the 7 month mark. Poly longhouses do pop up, but it will likely be 1 or 2 night blocks at a time.