mic the stacks, for solo acoustic it gives the best results.
In some venues, you can't get close to them. At the Ark, where I frequently record solo performers, they run a JBL PA and the four cabinets are all hung near the ceiling. There are two centered over the stage and one on either side facing 90 degrees out.
I agree that sterile soundboards are lacking.. I think they are important to archive if you can get them. I am planning on grabbing more boards with a spare jb3.. I haven't always bothered when I have had the chance.
I have thought about trying to place my mics closer then the first couple feet of the stage. I worry a bit about the performer wanting to move the mic stand. Now it is easy to say that probably and usually won't happen with solo... But then you have those cases where the opening solo performer comes out to sit in with the main act and they start adjusting and dragging, etc.
Since I often run actives on a bar, I could potentially make a small clip to unobtrusively attach my mics to the stand. But I worry about them being used as a convenient "handle" to move the mic stand. Another thought.. 4061's or ATxxx's on the performer's stand.
I record a lot of solo acts so I'm always looking for something better than setting my mics up in the sweet spot to take a mono PA recording.