Around Hawaii:
Is September the slowest season and does thing pick up during October?
I thought Sept - Jan would be slow season except holidays and Christmas time.
The problem might be that you are trying to exchange into extremely popular resorts. Even though it might be a slow season in Hawaii, I doubt the Westins & Marriotts have many vacant rooms at any time of the year. They run pretty close to 100% occupancy.
About a month ago there were many Hawaii weeks deposited by Westin (and also Marriott?) for this Sept. & Oct.. I know when I booked an exchange, II showed availability for Fri, Sat & Sun check-ins. I also had to decide if I wanted WKORV or WKORV-N. Then a few days later the new Napili tower at the Maui Marriott was available for the same week. I've never seen so many Westin & Marriott weeks available in Hawaii at the same time!
Unfortunately these deposits have pretty much been taken at this point. Unless there is another bulk bank for Oct. 08, you'll have to hope for a cancellation.
Good luck with your search!