The idea was to hit some of the big rides early in the day before the crowds really hit - Test Track, Mission Space, Soarin' if time permits - then hit up World Showcase for a while and come full circle back to Spaceship Earth and the more relaxing stuff after lunch, when the park usually clears out as tourists go park hop elsewhere or go back to their hotels for naps or whatever.
Speaking of FP+, I haven't been in to EPCOT in ages, and last time I did Fastpass was still fairly new and not as sophisticated as it can be now. Is it possible to book your FP+ online?