Hi Mark,
Your piece is majestic indeed! I like its energy, soaring main theme, and rich orchestral sound. The piece dives right in at the beginning - perhaps you can add some introductory material, just a few bars at least.
The main theme does get buried in the general thick texture of the piece. Perhaps add a strong unison statement somewhere in the piece?
At any rate, great work! I may comment further after giving the piece a listen again.
Jay