Hi, Alan.
Lovely track. I'm not sure which guitar parts you were unhappy with, because
I couldn't hear any issues.
As you said, subtle stuff in the background, but it works.
There's an option in BiaB to force notes to be "right" under
Track Settings | Fix "Sour Notes . That way, you could render out a "corrected" version of the track, and manually replace the notes in the original track.
There's also an option to "Change Pitch" within Audacity. So you can select the portion of the waveform that you want to modify, and only adjust that. That's something I'd do in my DAW occasionally when BiaB has a phrase I really like, but it doesn't fit the cadence I want.
Nice work!
