I have this beautiful Alfonso Iturra 5 string I traded for awhile back. Lately, it's come on this issue where it won't be perfectly intonated through the fretboard. The B on E string is off by 3-5 cents and is kind of noticeable, at least to me, but mostly when playing along to songs where there is another bass on the track. Less so, if at all, when playing with others. I took it to get set up and the guy said it might have some neck issues but he fixed it for the time being. Now, it's getting back to where it was before. When it came to me, it had really light gauge strings and was fine. I put on heavy flats and that;s when the issue started (I think). I have a few questions: -Would putting lighter gauge strings on help? -If a neck thru bass has a neck issue, is it junk? This bass is beautiful and I would considering spending to get it proper. -Any other options? I plan on taking it to another place to get set up to see what a second opinion would be. I don't want my main bass (the nicest bass I've ever owned) to be out of intonation when I play.