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I wonder if it was a hub designed for an asymetrical rim, but a normal one used or something. It's very strange anyway. I've just trued it, put a bit of tension into the NDS and it's about 5mm off centre (dishing tool is at my dad's). I've just taken it up and down the street doing endos on it and it's still true <1mm and perfectly round. Tension on the drive side is 13 all the way round, which is 100-120 depending on which column you choose on the TM 1 conversion (which one to use for CX ray is different depending where you look). Front, which I haven't touched, is 11. Non drive side is about 3.
I honestly don't know what to do. I don't see it failing catastrophically and killing me, but taking chances with carbon seems silly. I could sack it off and sell it as knackered, along with the working front and cut my losses, or keep it for flat, local rides (which seems totally pointless when I need a proper wheelset for hills this summer). If nothing else it has reminded me how much I enjoy building wheels so maybe I'll go down that route next. This has put me off secondhand carbon wheels for sure.
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dglshrn
It's a product of the geometry of the hub, the rim and the spoke pattern and you're stuck with it with no solution (that I know of anyway)
You would think the manufacturer would introduce some asymmetry to the rim, or increase the pcd of the hub ds to combat the tension balance, but apparently they haven't and instead build them dished off centre.