Dinner is a different beast than lunch. Lunch is a la carte with a recently added all-you-care-to-eat option. This has created havoc with the lunch time seating since they have no idea who will be taking more time with the AYCTE option until they order it.
Dinner is AYCTE for everyone, so they're a little better at seating. Still, I wouldn't go much past 7:00-7:15 for an ADR. Dinner will take at least an hour and you'll want to find your spot for Wishes once you're done. The restaurant is on the backside of the castle.