When are you trying to make the ADR for?? FD (Father's Day)?, Labor Day?, either one definitely a toughie. Locals on FD not to mention June being one of the busiest months at WDW of the year. Labor Day weekend=lots of locals, maybe that covers both reasons?
Labor Day is September 2. The 180 day mark for that is March 6. You'd have to be trying with a 180 plus 10 and that doesn't always work like it should. Try calling.
Sorry for any confusion we have a bounce back w/free dining and it is the Sunday b4 labour day I have been checking daily since our window opened up and it says booked for breakfast. Wow!