Sounds beautiful to me, Atrejan.  Not sure I understand your disappointment  with the 'choral' parts for the rock sections.  They too sound beautiful, but perhaps that was not your intention. 

If you are on the look out for different sounds - Maybe look at the choral synth presets in Analog Synth (Magic Music Maker 2105 onwards - if you have that version?).  Might offer you some alternatives?  Also I bought a vst called Voiceplex yesterday for under £20 (UK).  It's to be found at a site called Dubturbo.com.  Loaded fine as a vst into Magix and looks/sounds interesting.

A wonderfully put together arrangement, that would make a great soundtrack to something.

Cheers,
Nick