A setup for a guitar typically is about $60-80. They get the action right by looking at three things...
1) neck angle/relief... this gets adjusted with the truss rod. Most folks like it very close to flat, with just a little concavity...
2) saddle height. This gets adjusted via saddle height.
3) nut slot height. This typically is the last things to check and it affects mostly the action low on the neck.
I’ve had guitars where the action could be adjusted with just a little tweak of the truss rod, but more often than not that’s where a guitars problems start... with peeps thinking they adjust the action by messing with that bow.
I have a guitar getting worked on now by a professional. The prior owner shaved the saddle too low (action was buzzing at the low frets) and too high at the higher frets. He compensated for the saddle shaving by cranking the truss rod.
It was not necessarily intuitive, but the guitar needed the neck to be flatter, initially causing even lower action and buzzing. It needed the truss rod adjusted back to near flat, little relief. And it also needs a new proper Intonated custom bone saddle that’s higher than the old one.
I’m willing to bet your guitar needs the neck less concave and more flat AND it needs the saddle shimmed.
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