also you offer some dissonance in this piece that is not convincing to my ear.

I hear what you mean by this but it just sounds like one finger hit two notes in one particular phrase. The fact that it was consistent leads me to wonder if it was a mistake. The first time is at :26 where he uses a chromatic tone that should be down a half step to stay diatonic. It happens again at 1:04 and it's the exact same phrase and again at 2:35. Silver if your harmony there is not of the augmented sixth variety then the lower note of that phrase leading to the next chord should be down a half step. To give an example the melody sounds like it goes Db to B to C. That's a very unnatural phrase that would happen only if your harmony used an augmented sixth chord (which it doesn't) so there is dissonance between the B and the rest of the chord sounding at that moment.