[quote name='JazzBassfreak' timestamp='1396944115' post='2418887']
Definitely a twist. In theory I gather you've altered the two truss rods separately, when really what you do to one you should do to the other too. It's all about minuscule adjustments with a bass with two truss rods else they will counteract each other and so much can go wrong.
From my experience that bump looks like maybe in one place the truss rod has been tightened so much on the bass side it has probably hit the fingerboard and unfortunately most likely also will have twisted the neck.
My suggestions:
Get a good heavy string gauge, but leave them slack, take off all the tension from the truss rod on the bass side then tune the bass side strings (E & A) to say Eb to look where you're at. Adjust by tightening little by little over a week or two and keep checking where you're at with a straight edge and by sighting the neck. Leave the strings slack only tune them to check how the action is and if it looks like it's moved at all.
DO NOT leave tension on the D and G strings as this will pull the treble side and make the twist worse.
The neck is hard rock maple, if it is twisted it's gonna be a bitch to get out, so it may be worth looking into a tension jig to see if that may help.
As a last LAST LAST resort there's always the case of slackening both truss rods completely and slowly tightening them over a few weeks working with a straight edge each time.
Hope this helps
[/quote]
Good answer!
Definitely looks like a twist from those photos
I'd take note of JazzBassFreak's advice
Also, I was once told by a luthier,
that sometimes it's good practice to allow the trussrod(s) to "settle"
i.e. Don't attempt to over-adjust them all in one go
Allow a bit of time between adjustments
I think he mentioned a half turn every few hours.....
Make sure to let us know how you get on
but most of all - good luck
Marc