If the action is correct and the relief is right, then the neck doesn't need to be shimmed. It sounds like the intonation is slightly off, which is very common - it depends on string gauge and action height so a small adjustment in compensation is needed. If the fretted notes are sharp, the point of contact on the bridge saddle needs to be move slightly further from the nut, so the string is longer. Any competent luthier or technician can do this, and you can as well, if you are good with a file. You might was to get a new saddle and work on it, so that your original one is preserved.
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Brian Evans
Around 15 archtops, electrics, resonators, a lap steel, a uke, a mandolin, some I made, some I bought, some kinda showed up and wouldn't leave. Tatamagouche Nova Scotia.
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