Trying to understand target matching

So I read all those document, and trying to implement match target, but result are not always expected. Problems :

• match target stop before it reach target

• AFTER match target complete, something a unexpected force may append on my model.

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I had read the API document, and sort out some tips to apply match target.

1. match target only available on BaseLayer

2. when (animator.IsInTransition(0) == true) you CANNOT apply match target, warning will append in console

3. need to wait until GetCurrentAnimatorStateInfo(0).IsName(XXX) return true, which mean it's the animation you wanted to apply MatchTarget.

4. ensure the match target period are not overlap any other state, (2) happen and match target will cancel.

however, I still can't 100% fix the issue that I had mentioned above. well yeah... by follow the those rules, most of the time work, but not all of it... I record a video to show these problem, https://youtu.be/ju163R2WtM4

and following are the related code used in that video.

 // process climb up ledge
 animator.SetTrigger(m_LedgeClimb.hash);
 
 // Stay position & wait for animation
 rigidbody.isKinematic = true;
 Collider surface = hitResult.collider;
 Physics.IgnoreCollision(avatar.self.capsule, surface, true);
 
 // Wait for matching
 while (!animator.isMatchingTarget)
 {
     // wait, until we able to use match target.
     if (!animator.IsInTransition(0))
     {
         animator.MatchTarget(landingPoint, predictFacing,
             m_UpperHandMatching.m_AvatarTarget,
             m_UpperHandMatching.GetWeightMask(),
             m_UpperHandMatching.m_Period.x,
             m_UpperHandMatching.m_Period.y);
     }
     yield return null;
 }
 
 // Matching
 while (animator.isMatchingTarget)
 {
     yield return null;
 }
 
 // re-apply physics
 Physics.IgnoreCollision(avatar.self.capsule, surface, false);
 rigidbody.isKinematic = false;

hope someone can point out what I'm missing, or the direction thanks.