Its a good song...
But, there are some problems. I noticed that the style doesn't change even in the slow parts. It's always staccato, and there's no real change in dynamics, maybe a decrescendo into mezzo piano around 1:00, keeping the bass at the same volume, then at about 1:15 to 1:33 or so, a crescendo to forte with the bass crescendo starting at around 1:23. Near 1:55 to 2:02, decrescendo the treble to mezzo piano and the bass to mezzo forte, then raise the bass to fortissimo at 2:03 and dropping it gradually from 2:18 to piano at 2:30 with the treble dropping to pianissimo around the same point. Then, at 2:36, a crescendo again to fortissimo for both, and at 3:02, make a sfortzando and start Section A again (the happy part) and bring it back up to the original forte. After that, whatever the heck you want to be there. Maybe another key change, possibly a meter change to 3/4 time! Also, I think it belongs where you originally put it: the classical section. There's no real elements of jazz in there (no swing beat, no blues scales, etc.) if you think about it. Great song, and a dl once you finish it!