In case this helps anyone, I am building up several sets of A23 and Major Tom wheelsets and couldn't find the recommended spoke tension for these rims anywhere.
Here it is, I got the figures straight from Velocity:
117.4kgf rear (it's the 0.4 that makes all the difference ;-)
let us know how those rims work out, esp. for tubeless.
I'll have to get someone else to report on them, because although I'm building them I'm not riding the A23s, I am sticking to tubs (no pun intended) with Major Toms to race. I will get some A23s as I am already sick of adjusting the brakes and I have only swapped wheels out once!
FWIW, the listed ERD on Velocity's site doesn't match what I measured up.
I am using:
Major Tom 600 (they list 596 which leaves several threads showing).
I measure mine so the spokes are flush with the nipple screwdriver slot.