[最中「さいちゅう」] => In the middle of A N3
Time, Situation
[中心「ちゅうしん」]に => With A as the center N2
Miscellaneous
中 => While (Lasting) N3
Continuous
のうちに => Within... N3
Limit
途中で/途中に => on the way; in the middle of ~ N4
中 => During the period (Term) N3
Time
(の中)で~が一番~です => out of this group, [A] is best N5
か~ないかのうちに => right after; as soon as N2
そのうち => some day/some time eventually N3
Short period of time
か~ないかのうちに => Right after A, C N2
Time, Situation
かのうちに => right after; as soon as N2
Simultaneously
を中心に => focused on; centered on~ N2