Thanks all for the useful advice. Once I get the guitar back from the luthier (this weekend, hopefully), I'll try out various of the options suggested here and I'll feed back the results, good or bad.
One thing that I saw on another forum was a suggestion of trying to affect the resonance by putting weight on the inside (such as a coin attached on the underside of the bridge) or putting some bubble wrap inside the lower bout of the guitar. I might give this a go first. Any thoughts out there?
On the Alvarez Jumbo with the wonky G-note, I tried adding mass to the bridge with brass bridge pins. I even tried temporarily strapping a 3/8" bolt to the strings just south of the saddle. I didn't notice a big change, but that's just one guitar.
Little odd things often bug me about a guitar . . . typically wolf notes on the low end or odd high pitched harmonics on treble notes. I've sold some otherwise wonderful guitars because of that. My two GAD dreadnoughts aren't super high end but they are surprisingly free of annoyances. I'm surprisingly content with them.
Please keep us posted on what works for you . . . or not.
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