Unsymmetrical unwrap Problem


I have a Problem regarding the unwrapping in Blender. Everytime I unwrap my Model, I get a unsymmetrical unwrap, altough the Model is completely symmetrical. The Problem now is that I need a complete symmetrical Unwrap. Here are two Pictures showing what my Problem is : http://imgur.com/a/OrzSU . I already tried both Conformal and Angle Based unwrap but both didn’t changed that much.
I hope somebody has a solution to the Problem I have.