I'm still struggling with the name. My teacher suggested I perhaps focus on the character of the piece. So thinking of its different moods I considered things like "Cryptic Waltz", "Mercurial Waltz", "Obtuse Waltz", "Capricious Waltz". None was particularly accurate but that last one resonated. The work is temporarily called "Waltz Caprice".
I've made a few musical tweaks to the pieces - typical of the way I treat completed works.
Edit:
The above list of names emphasized the changing moods of the piece.
Some other options based on number of moods:
Indecisive Waltz
Equivocal Waltz
Ambivalent Waltz
Inconsistent Waltz
Discrepant Waltz
Incongruent Waltz
I kind of like "Incongruent Waltz".