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.

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.

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.