Some necks need a long time to relax so be gentle
Leigh Gordon’s mex jazz that I bought had a neck like a banana and took ages to come back to the land of playable
I use those thin plastic inserts that come in Next multi-sock packs
just cut to size. Thin, durable, don’t squash much and you can glide them into place by just loosening the neck a little - around 0.7mm thick
Given that he never changed his strings and used a foam mute I think any difference in sustain in his case would be negligible
his was a 62 which I think is not string thru - correct me if I’m wrong
He doesn’t always play root notes, listen to “please” and “bad” but sometimes that’s just what Is needed and we as bass players should not shy away from that as if we were guitards...
I look at your angled neck transition there (which you wouldn’t see on a fender) and I’m reminded of the story about the designer of the spitfire putting the chord on the wing joint simply because it looked right rather than for any objective engineering reason at all
Your ears will tell you if it’s wrong. There’re are no rules as far as I can tell besides if it sounds right then go with it, if it doesn’t it’s probably jazz
The recorded facts ? Yes that’s right, they are indeed emanations of the devils backside. Read book of Genesis (amended) - on the seventh day God said “unfinished business ... let there be sheryl crow, and also tort”
Said nobody with any sense of what a proper bass should look like. It makes the sound better; the more custard in it, the better the sustain** ... Custard sustains you ***
** this claim may not be fully supported by an objective scientific investigation
*** probably true in the absence of other calorie sources