Animator.MatchTarget broken with low fps

Hi everyone,
i have a matchtarget controlled animation for climbing ledges.
I just realized that it's not framerate indipendent, and when i have low FPS it does not work anymore.

Any suggestion?
Thank you in advance.

These are the gifs of the behaviour, is easier to show than to explain:

WITH GOOD FPS

WITH BAD FPS


I'm using a rigidbody character and this is the code i am using in FixedUpdate:

Code (CSharp):

1. if (anim)
2.         {
3.             AnimatorStateInfo state = anim.GetCurrentAnimatorStateInfo(0);
4.  
5.             if (Input.GetButtonDown("ps4_X") && climbHandPos != null  && !hasJumped ) {
6.                 anim.SetBool("Climb",true);
7.  
8.  
9.             }
10.  
11.             if (Input.GetButtonDown("ps4_analog_button") ) {
12.                 GetComponent<IKControl>().lampActive = !GetComponent<IKControl>().lampActive;
13.  
14.  
15.             }
16.  
17.             if ( state.IsName("Base Layer.Climb") && !anim.IsInTransition(0) && climbHandPos != null )
18.             {
19.  
20.                 anim.SetBool("Climb",false);
21.                 transform.rotation = climbHandPos.transform.rotation;
22.                 GetComponent<IKControl>().ikLookActive = false;
23.                 GetComponent<IKControl>().lookObj = null;
24.                 GetComponent<IKControl>().ikRHandActive = false;
25.                 GetComponent<IKControl>().ikLookActive = false;
26.                 GetComponent<IKControl>().rightHandObj = null;
27.                 GetComponent<IKControl>().leftHandObj = null;
28.                 GetComponent<Collider>().enabled = false;
29.  
30.                 anim.MatchTarget(climbHandPos.position, climbHandPos.rotation, AvatarTarget.RightHand, new MatchTargetWeightMask(new Vector3(1, 1, 1), 0), anim.GetFloat("MatchStart"),anim.GetFloat("MatchEnd"));
31.                 anim.MatchTarget(climbHandPos.position, climbHandPos.rotation, AvatarTarget.RightFoot, new MatchTargetWeightMask(new Vector3(1, 1, 1), 0), 0.4f, 0.7f);
32.  
33.                 hasJumped = true;
34.             } else {
35.  
36.                 GetComponent<Collider>().enabled = true;
37.                 climbHandPos = null;
38.             }
39.  
40.             if (hasJumped && state.normalizedTime > 0.6f)
41.             {
42.                 GetComponent<Collider>().enabled = true;
43.  
44.                 hasJumped = false;
45.             }
46.         }

 

Seems like flagging "Animate Physics" in the animator solved the problem.
I'll do more testing and in case i'll update here.