Erik, I hate to tell you this but the manual you are working from is wrong about the dihedral, 14mm is too much.

Golden gate updated their manual on the Atlanta on the second version to 12mm but even that was too much.

This much dihedral will cause it to roll out in knife edge flight when you apply rudder.

Using the method in the instructions for measuring the dihedral it should be between 8mm to 6mm, favoring the 6mm setting.