Just wanted to let everybody know that I called back today and was able to get my FDP changed from 4:30pm to 6:30pm. As a matter of fact, she said I had a wide variety of times to choose from and could take my pick.
I told her I'd been calling weekly and there had been no availability for these late times and asked her if they open up more as the date gets closer and she had no idea. She guessed that they must because she had many times available.
Yeah! I'm sooo happy because we won't be at MGM this day, we'll be at Epcot and I didn't want to head over so early. This is perfect!
So, my advice based on this experience is to call back around your 30 day mark(our trip is in 34 days) and you'll probably be able to get a later time for the dinner pkg.