I have a 2002 Martin 000-16SRGT. Whether it is more stable due to the shorter (12-fret), thicker (mod. low oval), or wider (1-3/4") neck, I don't know, but the neck is straight. The guitar has one truss rod adjustment.
When I first got it (last year), I noticed some string buzz on the lower frets, but I now use strings with the recommended top tension (PB 12-54), and the problem has disappeared.
Micarta is less likely to swell, shrink, or crack than ebony. As guitar necks tend to bow forward with time, I'd like to understand what would cause the back bowing that you describe.
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