Hmm..I'd call and see. I was able to get Chef Mickey's breakfast easily and within 15 minutes of the time I originally wanted when I booked on the 180 day mark. Maybe it's because we were trying for breakfast instead of dinner?
I had a hard time with T-Rex though. I couldn't get dinner, and had to switch to lunch on a different day.
Not to hijack the thread, but have you tried calling T-Rex directly. They always have more availability then they release to Disney's reservation system. The number is 407-828-8739.
I signed on at 6am at 180 and could not get dinner at either. Maybe something will open later?
How big is your group? I just looked at CRT for late Sept and see multiple openings for a group of 4 but none for a group of 8