Walking Anim Overriding Problem: Shivering arms!

I make a walking animation that plays well on my avatar, but whenever I add it to the animation overrider as Walking anim overrider, the avatar keeps shivering the arms! I've been trying to fix it the whole day with no luck, keyframing, raising the priority, i always get the same results: Plays great if played alone, plays wrong when using it in an AO. And yes, i have keyframed the arm parts. Any suggestion? Please lend me a hand!

This is just an educated guess, but I am guessing that you didn't perturb the collars.