Ok so as the fretboard starts to fall away the action is getting really high. If it's harder to fret notes there then could it be possible that you cannot fret it well enough to get a good tone? I've seen this with players who come in with super high action. They are not physically strong enough to fret the notes and as such they don't ring true.
It's a big enough guitar too so it could be perhaps that those high notes, short length of string which are light gauge and furthermore tuned slack, don't have enough energy to drive that top.
IDK I'm just guessing here.
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