Actually when you book ADRs at 180, usually you can get what you want, so I think you'll be okay. Crystal Palace will not be any help in getting to PP or 7DM, as the restaurant is back where everyone is allowed to wait for the park to officially open. Someone else can chime with more details on CRT as I've never done an early breakfast there, but as that is a signature dining experience, usually people are more interested in enjoying their time in the castle, rather than trying to rush through it in 30-40 minutes to get an early jump on the rides. I think it you are interested in eating an interesting (but quick!) breakfast and getting to the front of the lines for your initial ride, than BOG is the way to go.