On my bass (a 2008 MIM Fender P-Bass) the neck "bows" slightly more on the bass side (e-string side) than the treble side. When I press the first and last fret down on the e-string, I have more action at the 12th then when I do the same to the g-string. I think my neck may have a twist, but I'm not sure. Is it normal for the e-string to have more "bow" on the neck? If this is a problem, I can see it getting worse, since wood tends to do it's own thing, so I may have to replace the neck BTW: The bass is, at least at the moment, still playable.