i just rebuilt a mim tele and have found i get fret buzz playing on 3rd fret and up on some strings. Some of saddles are all the way down, when i play near 21st fret there is any plenty clearance near the 21st fret. truss rod is set so bow is minimal. Anyways, I'm thinking about placing wedge under neck close to neck pup, but never done it before. I would do that and loosen truss rod a little bit. Does this make sense? If so, what size width wise do i use and where exactly do i place it?
just stick 2 1mm dunlop picks under the neck and tape them down. Thats what I did and it worked great.