Volumes 4, 5 & 9 are definitely my favorites, which all happen to have a lot of Asuka, heheh.
I've never really understood how Evas work either. The way I rationalize it is they practice the dance routine more so they can move in tandem rather than for the sake of memorizing the actual routine, even if that's not how it was presented. I doubt Shinji can do back handsprings irl, or that they have an adequate amount of space to practice the real thing.