The Issue with Low Ranks

What's the deal with players below a certain rank? I dunno if its as high as the 100 rank when it stops, but I notice most of it is players beneath 80, and most of that beneath rank 50. In fact, the lower the rank the worse it seems to get. 

I'm talking about how in the past two days since I played again, I've gotten obliterated by single digit rank players and anyone under rank 50, while S ranked players aren't really giving me any trouble. Almost all of my deaths are down to players under the rank of 50, and the majority of those deaths tend to be under the rank of 30. They take more bullets to drop, they kill you in less bullets, and they have a disturbing knack of only hitting the head. Rounds are frequently being topped by these players. Kill leaders are the same. Last round the kill leader at the end was a rank 2. That same rank 2 absorbed a full GEW magazine and then blew my head off instantly at about 60m with a G57 pistol. 

They also have a peculiar ability to instantly locate you. These are players running as someone like Boris. They have no motion tracker, or scanner, or proximity detector. They have no turret active in the vicinity. They just run straight toward you no matter what. You can hear their footsteps but its not clear cut for pinpoint accuracy, which works both ways. 

So, what is going on? There is for sure a pattern here. This isn't just about somebody jumping in from another game and being good at shooters. There is a very distinctive gameplay advantage being assigned to them, as mentioned in their ability to kill you near instantly, whilst absorbing all the bullets under the sun. 

Its sucking the fun out of firefights because you can blitz your way through higher ranked and then this lone low-ranker saunters into the area and takes everyone out.