Wow, thanks, Noah! I appreciate the thoughtful comments. As far as this piece being a front-runner... maybe if the competition was a freestyle. I grossly misinterpreted the rules and thought the only development of the shared material had to occur at the beginning of each movement, and never recur. Listening to everyone else's thematic development of the opening theme—all I can do is facepalm myself. 🤦♂️Oh, well. The main thing is it got me to be inventive and use scales I probably never would have on my own.
I do know the piano. I don't know the cello. I play viola and violin. My friend, the dedicatee for this piece, is a stellar cellist. However, for some reason he decided to go have a career and do other adult things, so he moved away before I could have him "test drive" this. As it stands, the cello part was written based on my holding a viola between my legs and working out bowings and double stops and stuff. (Hey, desperate times call for desperate measures, am I right?)
Ah, yes, the "stuck" mood. My first excuse is I've never used these scales before. I'm sure that will hold up in a court of law. My second excuse—at least in my limited experience—is that not all these scales lend themselves well to warm, upbeat chords. (The warm passages you're referring to were largely produced by going back to the diatonic scales we all know and love.) For modes 4 and 6, the only major/minor triads one can create from a given scale are complements: for example, A major and Eb major. Modes 1 and 5 contain no major/minor triads. Mode 2 (octatonics) has a little more flexibility in that it has two pairs of complement triads, so one can generate a little more warmth. Mode 3 is super flexible—each scale has 6 major/minor triads and no complements—which is why the 2nd movement sounds more upbeat than the others.
This means the last 3 movements, being based on scales with harsh intervals, sounded similar in mood. I should have fiddled with the scales ahead of time rather than just composing with them in numerical order. Hindsight.
Thanks again for taking the time to listen! Cheers!