Thank you for your in-depth response! The guitars in The Herald were all recorded live by me, so no sample libraries there.
Looking back on it I probably should have used side chain compression to help bring out the cello in The Herald and Gluttonous Miasma to help reduce the frequency masking issues, that's a very valid point you bring up about it being hard to pick up.
As for All You Could Wish For, I always pictured that playing during a cutscene that shows the effects of the wish the player makes at the end of the game so the intense arpeggios made sense to me then, but I definitely should have made that much more clear in my description.
Thanks again for your feedback and response! It was very insightful