I fitted new Jota decals to the carbon sidepanels.
Then dismantle the wheel again, see where the chalk was scuffed and file it down.
Then reassemble and test again.
Repeat the process until the braking force is acceptable. The rear wheel took 12 attempts (all the above process 12 times) before I was happy with it.
And I have to do the same to the front brake tomorrow. Deep joy.