Animation Override Controller asset use / swap at runtime

Hello,
i'm trying to use animation override controller via the asset created through editor.
I've created a bunch of them, linked them as reference on my GameObject.

Now i'm trying to swap them at runtime using the the one that i saved, and the override are never applied.

here's my code

Code (CSharp):

1.  
2. //Reset to not override controller
3. AnimatorOverrideController myOverrideController = animator.runtimeAnimatorController as AnimatorOverrideController;
4. if (myOverrideController != null)
5. {
6.     animator.runtimeAnimatorController = myOverrideController.runtimeAnimatorController;
7. }
8.  
9. //create new Controller
10. var animatorOverrideController = new AnimatorOverrideController(animator.runtimeAnimatorController);
11. animator.runtimeAnimatorController = animatorOverrideController;
12.  
13. //fill new override with data
14. var dataOverride = this.RodOverrideController;
15.  
16. var overrides = new List<KeyValuePair<AnimationClip, AnimationClip>>(dataOverride.overridesCount);
17. dataOverride.GetOverrides(overrides);
18.  
19. //Apply it
20. animatorOverrideController.ApplyOverrides(overrides);
21.  

i don't understand, even if it's not present at all anywhere in the internet, why this does not work either :

Code (CSharp):

1.  
2. animator.runtimeAnimatorController = this.RodOverrideController;
3.  

i'm on unity 2017 1.1p2

Thanks