Faces move slow / not fully connected to bone Blend File:https://drive.google.com/open?id=1B_GELU2WhmT1O25J6V82O1IMIik_EF1F

Good Morning,
I been having this problem for 2 days and I don't know how to fix it, I created a vertex group to control the eyelid of the spider with one bone, but it is not working properly, the edge is not following the bone as it should, it is moving slower, I just need to know if there's a way to make the edge be attached to the bone no matter what.

Also I don't like using shape keys because I need to do other stuff with the bone that the shape key won't work with

https://gyazo.com/b246445672450727703520960e55e3b2.gif
The problem was that the edge was also being controlled by another bone and by changing the weight of the other bones it worked