New neck answers are out of the question because its a neck-through...why bother? Just build a whole new bass at that point as long as you have the saw mill running...you have to glue the sides on anyway. Another solution I'm not entertaining is to build a new neck and turn this into a bolt-on.
Ok, now we're all on the same page?
The bass was built in 2002, so I dont think its moving any more...although, it tends to move all day. Like, it will be buzz free in the morning, and buzz city in the afternoon/ night. It's like it resets all night when it's cool.
Can this be fixed with heat? I've removed fretboards before so I've got a flexible heat strip that works splendidly.
When rigged up and heat applied, wont the glue warm up and the laminates shift causing uneven sprouts?
What about the fretboard and frets? Same thing? Sprout?
What about removing the fretboard and planing, then replace the fretboard? Is that a better solution? Maybe install some carbon fiber rods for future protection?
Having asked all that, now I'm thinking since it moves from morning to afternoon, it may be the truss rod itself causing all this if its cranked down, no? I opened it up but in typical boutique fashion, the truss adjustment area is the exact size of the rod...not of the tool to get in there so I couldnt loosen the thing to find out how cranked it is. There is a lot of thread showing so I assume its jacked down pretty hard.
I can sent this back, but it has to be today for the 48 hour trial period. I really want to keep it because it really sounds great and plays super duper...except the buzz from frets 5 down on the ADG strings because, well...the neck is fucking twisted you know?
Its so slight that its easiest to see holding the bass like this;
Darren, Max, Adam, Dan? Gaiz!? Hello? Hello? ....Radio?
Wow that's pretty noticeable.