Actually there is a way to counteract the post/corner routes...
and it has to do with Aggressiveness rating of the defensive backs...
As far as I can tell, the coverage rating is pretty much all about countering the route running skill of the receiver... obviously, a corner with a higher coverage skill will be able to stick with a receiver better, but when it comes to making a play on the ball, another attribute takes over (you'll notice thats pretty obvious when you're throwing a deep pass and the opposing corner seems have pretty tight coverage but slows down at the last second or so for no reason...)
I implement the
127/64 Agg formula (with some tweaks) on every roster I download just to take away that money post route... and it does improve other areas of gameplay, imo...
I do have to do a global decrease on all the catching and coverage ratings for corners, safeties and linebackers since they'll go for the pick a lot more with the higher Agg rating...
but all in all, it gets the job done pretty well..