I'm working on this movement too, I am a music ed major. The only real secrete is to relax and make sure you are using the correct air flow. I had a friend working on this piece and he would practice it twice down an octave and once up to ensure he was hearing the correct pitches (...
On Ride, make sure your rests are the right length. You can do this by singing the trombone part (they just repeat what you stated). your tone is very nice, I enjoyed your playing. Are you playing a MW?
@MidgetDances you lost that play!!! LOL!