I have never liked the sound of a piezo pickup on a guitar unless it’s powered by an 18 volt preamp. The piezo just sounds squashed to me. Back in my day - well before real piezo gear - we’d use two cardioid conderser mics, one around the 12th fret and another between the soundhole and the bridge. But you have to make sure the distance between the two is more than 18 inches or so or you get frequency cancellations in the stereo signal. Another trick was to point two condenser mics at the 12th fret, one pointing toward the body and the other toward the ehadstock. This seemed to work ok too and as long as the mics were less than an inch or so apart there was no frequency cancellation going on.
I think the first option sounded better, though, and if the room had a nice freverb to it, that helped a lot. The stereo signal on the first option sounded much better.
I might have to do this again. Recommend me a condenser cardioid mic?

Also - I have a piezo and a mic on around the 12th fret of the guitar. The piezo is very bright and gives too much “quack” on its own. I turn the top end down on the piezo and bring up the bottom a bit and pan that left 25 per cent. The mic’ed input I pan right 25 per cent with a little more top end and a little off the bottom (I have a large-bodied dreadnaught shaped guitar, so it can be a little boomy with a standard dynamic mic) That’s it and it sounds like this

Hey when you record your acoustics,do you just use the piezo output or do you mic them up?