There is a GP offer thru Oct. 3. Why don't you book with that offer and if the AP is better, then call and get the better rate if available.
I booked with a GP rate last year, and when the AP and Florida Resident rates came out (which I am eligible for both), they were no better.
I wish there was an GP RO offer out now for December, so I could book our trip.
https://disneyworld.disney.go.com/special-offers/room-saving/