So far I've been able to add all extra days of dining (only 4 more days to go). I was also able to get Fantasmic Dinner on 8/20 at 5pm.
I'm glad you were able to get some more of your ADR's booked. Where are you booked for Fantasmic? I was told they only seat until 4:55 for the package but maybe that was just at H&V.