I have only been recording for a short period of time, but have been playing acoustic for a long time. A technique I have used in recording is something i learned playing about ten years ago. Position your mic near a corner of the room you are playing in. Play your guitar a couple feet away from the mic. The room acoustics often catch the acoustic sound better. In the middle of the room the sound of the guitar escapes more, and the closer the guitar to the mic, the muddier the sound. I beleive, but may be talking out my keister, that the heavy strings drone out the higher end sounds the nearer to the guitar you get. Try the same thing with the bare ear. Have someone else play and get closer and farther away from the guitar and judge for yourself.
Denis