I'm not sure the other comments here are accurate; the "uncompressed" versions have an uncompressed dynamic range, not quality (Spotify only goes up to 320 kbps as far as I'm aware), and the TSFH website store only includes merchandise, not the albums. CD Baby used to offer lossless downloads, but I think the only options left now are 1) Purchasing the CDs (which are available on CD Baby and Amazon) or 2) Purchasing the albums in FLAC format on the Tidal Store.
Two Steps from Hell: http://tidal.com/us/store/artist/5639233
Thomas Bergersen: http://tidal.com/us/store/artist/5448494
TIDAL is definitely one of the better options for listening to TSFH; most of their work is available there (minus Battlecry). If you're in Europe, I hear Deezer is also an excellent option (I live in the US so I can't vouch for it); according to my European friend, the TSFH selection there is fairly complete.
Amazon Music, I just found it on amazon too, hopefully that link works for you, I just searched "humanity - chapter II" with two "i"s instead of "2"
Maybe Aya Peard : https://www.linkedin.com/in/ayapeard "Featured soloist on TSFH commercial studio albums including: Skyworld, Invincible, Archangel, Nero, Illumina, TSFH Classics and Upcoming"
http://everynoise.com/engenremap.html On this site you can actually see an overview of all Spotify genres, and if you click on an entry in the list, it will show you the most relevant artists in that respective genre
Spotify lists most of what you mentioned under epicore - http://everynoise.com/engenremap-epicore.html
I never heard of dubchestral until now - it's pretty cool. I typed the term into YouTube and it listened to a couple of songs by Really Slow Motion and Immediate Music. I recognized a couple of the tracks - it seems they just added a dubstep beat to their already published music.