Absolutely perfect fretwork is the key to the most uniform and best possible action. I use a Stewart McDonald Neck Jig for all my leveling and refretting. This allows me to accurately simulate the effects of string and truss rod tension on the fingerboard and plane of the fret tops. I remove only the minimum amount of material necessary. Crowning is also of critical importance and can affect the feel of the frets.
Proper crowns make old fret wire that is now below maximum height feel more articulate.
Polishing is to beyond 2000 grit for an extremely smooth feel. Refrets- includes removal of old frets, truing up the fingerboard, slot preparation, installation of new frets and then fret leveling and setting up. Often, but not always, a new nut is required. A wide variety of fret wire is available and the fingerboard radius can be changed if desired, so the sky is the limit. Careful fingerboard preparation allows completion of the refret to be done with very little leveling required, thus extending the life of a new fret job.