Bought a MIJ P-bass about a year ago. (I'm mainly a guitarist, so wanted a bass for recording, etc.) Haven't played it much and never bothered with the setup until now. - neck looks very straight, so figured truss rod adjustment not necessary (pressing first fret and 16th and string still a bit above 7th fret, so I think neck relief is about right) - action was still high, so I looked online for suggested height and set it about there (my touch is light, so about 2mm on G at 12th fret; almost 3mm for E string) So, playing better, overall. But then I noticed playing from about 14th fret and higher there is buzz. So, I'm wondering if a 'reverse shim' might fix it. 'Reverse,' because it seems shimming is usually done when the neck needs to lay flatter, to allow the bridge to set the action properly without having it in its lowest position. So, instead of putting the shim in the bridge end of the neck pocket, I'd put it in the head end of the pocket. (Then, of course, I'd need to lower the bridge as the shim would make the action higher along the length of the neck.) I'm thinking that the part of my neck where it attaches to the body is too flat, and needs to tilt up a bit, so there is some string angle between the the bridge and the higher frets. The action is good along most of the neck; it's just the higher frets that have a problem. Or is something else going on?