This is the problem with 1900 PF. Everytime we have eaten there if we haven't had an ADR at or right around opening or later in the evening like 7:30 or so, its been a long wait to be seated. I asked once because it was just taking SO long and we were really frustrated and they said its because the characters take longer to get around the room and people wait to see them.
There's always a chance though. In March DD and I had a later lunch ADR for Sci-Fi but decided about 11:45 or 12:00 that we were hungry then. Since we were close by I went to the podium to ask if we could be seated early. I think she misunderstood me at first and thought I was a walk up. She said we could wait but it would be awhile. When she put our names in she was like, oh you guys have an ADR its just for later. We can probably seat you in a few minutes. We were seated shortly after that. So its worth trying. It was like she just let us check in early or something, I don't know. And there was a large crowd of people waiting to be seated.