It depends on which resort you are looking at and which resort is your home resort. We had no trouble booking an OKW GV for a week in October, but we are members there. OKW and SSR have the most GVs so those will be the easiest to get, although if you do not own there you'll have to take a chance at the 7-month mark. I believe there are only 6 at the BWV and the BCV & VWL don't have any. I'm not sure if AKV has any in Jambo House but they will have some in Kidani Village when it opens. If you own at AKV (which your signature suggests) you'll have the best chance getting one there at the 11-month mark.
The GVs are definitely the most difficult size to book. At HHI it can also be difficult to get a Studio or 1BR, particularly in the summer months, as that resort does not have many of either size.