I'll have to discuss what i stated about the choir in my previous comment; I needed more than few listens to actually appreciate it, but once I got it, I can say it works very nicely with the instrumental, creating a nice, great contrast between the darkness of the track and the witheness of the choir itself, while merging into an irrepressible flow. Perfect. I bet that this could kill people if properly played into a mix, but I don't have ideas on how to do it (yes, I'm a sad person).
those choirs sounds very unfitting to me, but i think that some distortion or delay in them could be interesting. the track is beautiful, but the choirs break it. my english sucks.