I also have the problem. Now i lossen the rear axle 2-3 rotations and hit the non drive side rear stay once. Then i can unsrew the axle. The head/washer gets stuck in the carbon cutout.

Second problem is the water in the frame after a ride in the rain.
I will drill a hole under the BB to drain the water. Until now i drain the water with the rear derailleur hole. Last time it was 150ml of water. The water even damaged the BB bearings.

UNI 50 with carbon spokes.

I fixed the problem myself so no i didn't contact him again.

FYI
Relubricate the drive side bearing! Mine did run really rough at 300km/180mi with one wet ride.
Theres almost no protection against moisture for the outer bearing.
I contacted Leon with this problem, only with the answer that they will look into it. No solution after >4 weeks.

A little bit of grease from the factory could protect the bearing.

56 ordered 05.November
Wendy estimated the arrival around March

Do you guys know a suitable handlebar which is 360 or 380mm wide?

LC has only an 400 wide option. With 370 shoulders not ideal.