Question What's the best way to make a gameobject invisible during an idle animation state?

So I've tried making a short animation clip where the gameobject has its mesh turned off to make it invisible so it's not just frozen in the air - but that seems to knock the objects slightly out of position & is causing lag. I've also tried adding this to an idle animation node to no effect. Any ideas what I can do to make them invisible without messing up the animations? RootMotion is enabled, if it makes a difference.

Code (CSharp):

1.     override public void OnStateEnter(Animator animator, AnimatorStateInfo stateInfo, int layerIndex)
2.     {
3.         animator.gameObject.GetComponent<MeshRenderer>().enabled = false;
4.     }
5.  
6.     //OnStateExit is called when a transition ends and the state machine finishes evaluating this state
7.     override public void OnStateExit(Animator animator, AnimatorStateInfo stateInfo, int layerIndex)
8.     {
9.         animator.gameObject.GetComponent<MeshRenderer>().enabled = true;
10.     }