I remember the military bands using the Watkins-Farnum books to test sight reading ability. They were written "almost" musically. They were off just enough to make sure that you were REALLY paying attention.
Sight reading is practice. Grab anything that you can: clarinet, oboe and saxaphone music too. You can't get enough of it. I would also recommend not lumping music into the "assorted stuff" section of your practice session. That is a dumb thing that many players do. Music deserves the most prominent place in ANY routine. It is just plain stupid to put music at the end when we are wasted. With 2 1/2 hours, 1 hour should be tunes - right after the long tones and slurs.