If you have the bass in hand, you should be able to see any humps in the neck yourself. Sight down (or up) the neck, and compare the distance from the bottom of the string to the tops top the frets and you aim the neck up and down. The light reflecting off the tops of the frets is a good reference.
Frets being low means they have been crowned at some point. Unless it's custom ordered otherwise, we use jumbo frets. They are not ground low when new.
If it's one side, you may also try raising the bridge on that side.
Is the string nut baseplate damaged? Looking down while in a stand, is the string nut baseplate flat?