Oh, I agree with the tympani roll suggestion a lot. At the quiet piano section at 2:15ish, in between the trumpets interjecting, I think some dramatic tympani work there could be very appropriate and help carry the tension back to the the initial climax.
But really, this is a wonderful piece of work. Excellent, excellent job.
Edit: I guess that part also happens around 40 seconds. Would work there too.