My man! I knew you had a discerning ear from your spot-on mix downs on your tracks but I have to say I am impressed you noticed that. Those kinds of techniques really need a mic close to the fretboard to come through properly in a recording, I didn't think it came through well when I listened to it so good ear!

I have tried to add a lot of little rhythmic grace note elements to my fingerpicking style - various slaps of thumb and palm and nuckles, muted strokes, and scratches along the strings as you noted.