>Towering crescendos, soaring synths, just galaxy sized everything peppered with quiet reflective moments occasionally backed by a narration that gives some backstory.

>Just larger than life tracks dripping with gorgeous excess that slowly build into these overwhelming wall-of-sound crashing crescendos.

Sounds like Post Rock and Post Metal. Check out bands in those two subgenres.

Bands like Isis, Neurosis, Pelican, Cult of Luna, Explosions in the Sky, Godspeed You Black Emperor, Mogwai, Slint. Those could be a good starting point for such expansive subgenres, that will provide plenty of what you're lookin for. Keep an open mind, have fun exploring.