There is much about playing that cannot be said. Here are some things I am doing to get the sound and space I am in.
All of the music composed since 2004 has been in a D minor 9 tuning: DADFAE from the bass string up. Although a minor key brings the mystery, it is very stable by itself; you add the ninth (E) and it suddenly needs to resolve. Ergo, it moves, so you have a sense of moving through the mystery.
I am also tracking four separate control sets as I play (they are tracked with my body rather than my mind). First, I play the actual structure of the piece, as composed. Onto this I add the ornamentation and passing notes. While doing that, I control a separate flow of compression and expansion, subtly speeding up and slowing down as I feel the energy requires. Simultaneously, I control a separate layer of vibrato, using the whole guitar ( not just the fingers ) to add an ever-shifting series of waves to the sound.
This results in a complexity that produces in any close listener a very quiet mind, and a fascinatingly expressive beauty, if one does it with an open heart.