I honestly wouldn't recommend getting a flash pass for the 11th. Normally Mondays are a little less busy and also some of the children will be returning to school around then.
Also, when entering the park, most people choose to go to the right into Hometown Square, but I would suggest going to the left, into Orleans Place and it will be less crowded and it will allow tou get some rides in before people make it around the park.
Just my thoughts.