Rotate bone to Spring Arm?

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Hi everyone, i need rotate bone (spine_01, spine_02, spine_03) in the direction of spring arm, but this work only in one direction, how i can fix this please? It’s 2 days a try every method, i’m hopeless, someone can explane me how i can do? I attach 4 file of my script.

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PS: The player rotate to the spring arm after 90 angle, i need rotate only spine in the direction of spring arm like Resident Evil 4

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I fix this (Little bit), with delta rotator.
I hope I can help someone.
If someone have a good method for make this i can try, thanks.