I would try to push the percussion back, it\'s a little front and center. In general, the soundstage is a little crowded. Sometimes a bit of subtle delay on one channel or another of a track will help break up the clog.
There is an ascending tutti figure that happens first about 1/4 of the way through and again at the end. The harmonies are a little awkward...I am not getting a clear intention of harmonic direction there. I would check the individual lines there and make sure all the parts are playing an interesting line, and let that inform the blocking of those chords. Perhaps opening up the voicing as you go up in tessitura would help those sections.
Finally, I would perhaps lean a little less on the \"big swell to sudden emptiness\" trick. Once is enough...that device is really becoming a cliche.