I started over 1 year ago planing our upcoming vaction may May 18th -26.
First thing is just book a room, if you are worried about getting one. I don't think that your dates are considered busy times.
Then I purachased hubby a ap voucher hoping that we could change the ressie over to the Ap rate. These don't come out until about 2 months prior.
I started with a regular rate, then when AAA came out is was better than the Disney Club discount, so I asked for the AAA rate.
Then I watch for codes that the public can use. Check and see which one is best nad go with it.
One of my original room went from $154.00 to $84.00 and the other one went from $420.00 to $320.00.
I hope this helps.