FOSUserBundle password validation

I'm attempting to override the current validation for passwords in FOSUserBundle. I've tried a few options, but I still can't find the solution.

To increase the password's MinLength, I created a validation.yml with:

# src/Acme/UserBundle/Resources/config/validation.yml
Acme\UserBundle\Entity\User:
    properties:
        username:
            - MinLength: { limit: 3, message: "Your username must have at least {{ limit }} characters." }
            - MaxLength: { limit: 255, message: "The username is too long" }
            - NotBlank: { message: "Please enter a username"}       

        plainPassword:
            - NotBlank: { message: "Please enter a password"}
            - MinLength: { limit: 8, message: "Your password must have at least {{ limit }} characters.", groups [Registration,Profile]}
                - MaxLength: { limit: 255, message: "The password is too long" }

Acme\UserBundle\Form\Model\ChangePassword:
  properties:  
      new:
          - NotBlank: { message: "Please enter a new password", groups [ChangePassword]}
          - MinLength: { limit: 8, message: "Your password must have at least {{ limit }} characters.", groups [ChangePassword]}
          - MaxLength: { limit: 255, message: "The password is too long", groups [ChangePassword]}  

Acme\UserBundle\Form\Model\ResetPassword:
        new:
            - NotBlank: { message: "Please enter a new password", groups [ResetPassword]}
            - MinLength: { limit: 8, message: "Your new password must have at least {{ limit }} characters.", groups [ResetPassword]}
            - MaxLength: { limit: 255, message: "The new password is too long", groups [ResetPassword]}

This is working for me fine on /register, but on /change-password the default min length validation from FOSUserBundle is taking ownership.

To state my question more clearly, what is the correct way to set the MinLengt