i like the idea of using stereo micing techniques....
and when i DO, i take care to find the best spot in the room...
locate the best position for the two mics to NOT pickup all the boom of the soundhole....
and try to minimize the phase issues.
but more often than not,
i just simply use one mic.
i put on my headphones, set the mic up usually pointing at the point where the neck joins the body,
aim, and then move myself around the mic, until i hear what i like.
then, i freeze!
LOL
and try to minimize body movement, and really focus on how the sound is projecting into the mic, and i play to that sound.
it is so much easier mixing one good mono mic capture, than futzing around with a poor stereo mic capture.