This hack deals with the passing game. I always felt the difference between the great and bad QB's was too extreme. You can achieve this somewhat by limiting the maximum and minimums but it gives you less player variation that way. You lose some of the granularity and range.
Here is an example. Say you have Bubby 25 PC throwing to a 50 rec WR. He will only get a standing still coverage catch 2% of the time against defenders ranged from 25 to 81 int. I fact only vs defenders 38 int or lower w