Alan -
Just following up in a slightly more compact fashion...
I think if you increase the relief, you may find that you can get the string height considerably lower without buzz. Early in the discussion, it sounded like you were not able to get more relief on the treble side at least, but if you can dial in 4/1000th more you'll probably find that you'll gain freedom in how you pick/pluck the strings.
The buzz comes from the component of the string motion that is perpendicular to the fingerboard when you play the notes. When you're fretting at the 5th fret, you've got probably 18 of frets that the string can bang into, and the highest amplitude of motion will be over the 14th fret or so. Some extra relief will buy you a little more room there and allow for that lower action you're looking for.
Good luck,
David Fung
