Re: Fretting sharp on the 12th fret E string
Maybe it's a worn fret so it's hitting the next fret up, that's my best guess. You can verify it's a geometry issue by temporarily raising the bridge height on the E side (if you have an adjustable bridge). For non-adjustable bridges, use a paper shim (like an index card, some kind of thick paper or multiple layers) - it will not be good for the tone, so not a permanent fix, just a way to test the issue.
Neck could be off too, but seems less likely if it's just a single fret.
Take it to a luthier, likely a fret level or refret wil solve it, and they should be able to tell you what your options are.
Davey Stuart tenor guitar (based on his 18" mandola design).
Eastman MD-604SB with Grover 309 tuners.
Eastwood 4 string electric mandostang, 2x Airline e-mandola (4-string) one strung as an e-OM.
DSP's: Helix HX Stomp, various Zooms.
Amps: THR-10, Sony XB-20.
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