Great work and well recorded. I missed this somehow, but will now share it.
A tip, since you said you use erasers: I use electric erasers and also some hard typewriter erasers for work I do on panel. For the electric erasers you can get different hardnesses also. For fine lines, I 'sharpen' them with sandpaper. Speaking of sandpaper, I use it also when I work on panel with charcoal and pencils, to push back or soften some areas.