Ok, thanks. Needing to push down harder doesn’t sound like you are describing buzzing, but rather just high action.
Based on what you are saying, yes tighten some more. If I have kept track, so far you have changed it by tightening about 1/4 of a turn from where it originally sat. You said you can’t see any change up the neck, are you seeing any change at all? Do you feel resistance to the tightening of the nut? The reason I ask that is that if the truss rod was set such that the it was not under tension, tightening will have no effect until the nut seats.
I would keep tightening (in increments) until one of the following occurs:
- You get some indication the nut is bottoming out such as a sudden change in resistance to turning or an odd noise.
- The relief is gone, and the neck is flat.
- You start getting buzzing at some frets (this often occurs at the lower frets, but could happen anywhere). This is normally what one would expect to stop flattening the neck unless the action is fairly high.
- If you get to about a half turn total and no changes are evident, I would be inclined to take it to a luthier to ensure nothing is wrong with the truss rod. I don’t have experience with Washburns, but every guitar I have worked on has had noticeable change within about 1/2 turn. Note: some have taken more than 1/2 turn total to get where I wanted them, it’s just if the rod is under tension one would expect to see changes without too large of a change on the rod.