I think you’ve got hard because team follow some rules or norms, is idea came just now. For example they can use some steps like levels, and your track is stuck in some of them. Like 1 - idea - your track is not ready about arrangement, not complete. Second is may be quality of sound (mixing) and even first step is ok, but 2 not good, you will get soft rej. And there could be other steps, but because 3 or 4 steps from 5 are fail, you cant get even soft, is only hard. Even in your case when the music is good.
It’s just an idea, i don’t know how it’s work. Check my last work, i also was thinking that they will not take it but is done. There is intro, theme and big culmination. I think if you rearrange totally 70% your track, is will be already new track and they have to allow it) I believe there is good people work and they will appreciate it)