[mirwa]

Without seeing your neck in person, all comments are....

Many times a neck has a wave going through the board itself and cannot be rectified through truss rod adjustments and or fret levelling.

In these situations the height of the string above the fretboard is very limited and lowering almost always encounters fret buzz.

It is common to remove all the frets and deal with the board issue and then refret to rectify

However the refret is only one option of repair, many other avenues can be approached but only after a visual assessment has been carried out

Steve