Getting rank at The Plague is too difficult.
Sorry for my not ideal English.
I can suggest than "Chaser" emblem grows too slow at the Plague. May be the other emblems can be with bugs at her.
For example, I suggest you to Watch this video:
At this video killer got normal 3 emblems. But not "Chaser". As you can see, killer chased all survivors enough quickly. At this video player made a lot of actions and made 4-0 without camping and tunnel. Survivors did not repare all 5 generators. And killer did not get the rank pip. May be this video is not an ideal example but similar situations happen very often. Getting the pip at red ranks is almost impossible for The Plague. Only for her. Not for the other killers. It is very difficult even at purple ranks. I ask you to solve this problem.
Thank you for your attention.