Thanks guys.
I'm finding that the Moses neck is fairly flexible vs a standard wood neck in that, the front to back profile is pretty slim and I'm using 50-105 flats. I'll set it up with some small truss rod/action tweaks, do a gig and leave it for a while.
The next time I pick it up it will need some re-tweaks. Nothing drastic, but it takes a couple of days to settle completely.
I have a Geddy clone with an original MIJ neck that is crazy slim. That's another bass that needs shepherding more often than usual. It needs a little TLC whenever I pick it up. Plays great when its set up though.