The answer is you sell it and buy a Tacx Neo with motion plates.
In seriousness though, you have to use the axis feet to cant the base rightwards as much as possible, shimming the front foot if it raises off the floor. You may also need to further shim the left foot to raise it further.
It defies belief Wahoo could sell this at such a cost.
Having done some further measurements, I no longer believe the issue is the with the flywheel. The top unit of the Kickr has an arc of movement of around 0.8 degrees. When the base is levelled (as per this link), the center of that arc should be 0 deg (vertical), left of arc should be -0.4 deg, and the right of arc should be +0.4 deg.
The problem is it doesn’t. The center is around -0.8, the left -1.2 and the right -0.4. So no matter how much you lean the right when you are riding the bike, you will never feel upright.
This is using a digital spirit level on the trainer “wheel” (which I assume must sit in the vertical plane to be in alignment with the cassette, the bike dropouts and the flywheel - it certainly feels that way to my body).
The net result is you have to set the base to a stupid angle for top unit to be able to be vertical. If I had known this I would never have bothered buying it. It is not that it is difficult to do, it’s the fact you have to bodge a $1,600 product.
My next question is whether this affects all units, or is an issue of manufacturing tolerances that is clearly affecting a large number (including influencer versions). But I am not seeing many people that have actually bought it.