I've looked at all the stickies on setup and notice everybody avoids the height of the nut slots. No mentions of string break angle throwing off intonation in lower frets, no discussion of the how low a person can go with the nut (.010"/.25mm at first fret) without buzzing on open notes. Nothing, nada. Instead, they start with discussing the neck bow and playing action and adjusting the saddles for intonation. Reason I started this is I have worked on 4 basses in the last 2 months that all had the same issue straight from the factory and a store setup - super high nut slots which made getting good intonation on the first 4-5 frets impossible due to break angle issues.. Here's the basic theory I work under on nut slot height: 1.Fret (capo is better, more consistent) behind first fret with light-medium pressure, pluck string. IF no buzz we can continue and check the distance under the string at the second fret while the first fret position is held by finger or capo. THAT DISTANCE, if created between the open string and the first fret, will theoretically still leave you a non-buzzing open string. This is how a zero fret works. Your nut can do the same. I'm hoping for commentary and competing theories to increase the overall user nowledge, including mine.