MRTK 3 Pinch Recognition On HoloLens 2

Hi everyone, this is my first time posting here. Please let me know if I messed up something in this post.

I am optimizing a HoloLens 2 application developed with MRTK 3 in Unity, and I have been trying to improve the sensitivity of pinch recognition. In other words, what I wish to achieve is that the object manipulators in the application are only activated by pinching when the user’s thumb-forefinger distance becomes 0 (or at the least very close to 0).

I set the pinch open threshold and the pinch closed threshold of the hands aggregator subsystem of MRTK 3 to 0.08 and 0.03, hoping that MRTK 3 will only recognize pinch in the more sensitive way mentioned above. However, the object manipulators are still activated by pinching even when the user’s thumb and forefinger are quite far away (about one half of the length of the user’s forefinger) from each other.

Is this because of the hardware limitation of HoloLens 2? Is there any possibility that I can improve the pinch recognition on HoloLens 2? Big thanks in advance!