No, unfortunately. I don't have AAA. I think my friend has it, but you can only use one discount at a time. The Premium AP gets you 15% off at most restaurants throughout DLR, so that was my discount of choice! The Deluxe AP gets you 10% off. AAA is also 10% off.
I know that sometime in August is when they go back to off-peak (I had previously thought they didn't revert to the off-peak rates until September, but another DIS-er had indicated that August was when the rates drop back down), but I am not sure if it is during your time frame or just after it. I am sure you could call the Dining number and find out for sure. It seems like the last time I called Dining number about Goofy's, they seemed to vaguely imply that they may occasionally 'shift' the start and end dates of their peak and off-peak seasons. So maybe that is why I remember September. Perhaps one year the off-peak rates started in September, and maybe this year they will drop the rates in August? I am not sure about the dinner prices, but the Goofy's breakfast/brunch prices seem to fluctuate by about $5 - $6 or so during the seasons.
I was just thnking the other day - Goofy's is my favorite restaurant in DLR. We have been eating there for so many years that it is a habit now. It is part of our whole DLR experience. It's a 17-year ritual! So I wondered if there was a cut-off point - assuming they keep doing overall, general price hikes every couple of years - at which we will stop eating there. For the time being, we are still hanging in there with it because we love the variety and quality of the buffet, as well as the characters, of course. But I wonder if their prices got to be, let's say, $50 per person, would that be too much for even the diehard Goofy's fans like we are? I know a major price increase would alienate a lot of other people who could take or leave Goofy's, but I wonder if we would still go there at even a $15 increase in price. Hopefully, I will never have to find out!!