Hi, unfortunately here in Greece, at least in Thessaloniki, there isn't a luthier who specializes in making guitars. All of whom I know build (make) other instruments as well. But I think this is the problem. There isn't a guitar luthier who is an advanced guitar player as well. I think they don't even know the demands -requirements (don't know which one word is the appropriate) of a classical guitar player. I 've taken my guitar (Sanchez 1035) to 3 luthiers. The two of them didn't do a good job. The third one who is currently working on my guitar is a litlle better. He has done a good job on my frets, but the guitar when I hit the strings, one at a time, with much tension a noise is heard by the contact of the string with the fret (don't know the exact word for this, so I am saying it peripfrastically).
The luthier told me that the warp of the guitar is normal (has a litlle warp)
and the height of the strings from the fingerboard is normal too. At present, me having not taken the guitar from him, he put a thin plastic under the bone (in the right side, not in the left) and so the action became bigger. However the noise, heard by the contact of the string with the fret, didn't vanished.
Is there anything else that could be done? May be a litlle more warp would be good? The frets are well put, and they don't seem to be the problem. I am asking for general advice, I know you can't guess without having seen or play the guitar. When I getthe guitar, and the same problem continoues, I could upload some photos (I'll try to photograph the important points) for you to have a look.
That kind of problems must have been discussed several times, but I don't have enough time to search the forum for the appropriate answer.
Sorry for being tiresome.