Maybe this is the way you want it to work, or maybe there is no good way to fix it but I think top level WRs (90+ OVR) are way too effective at the moment.
In one Test league I am running there are 2 WR with 2000+ receiving yards, and a third with almost 1900. Even with a 17 game season this is pretty crazy.
I understand that 2000+ receiving yards is theoretically possible BUT even with the extra game only one, maybe two WRs in nfl history would have been on pace to hit that mark.
Their target percentages are reasonable-ish (39%, and 29%) but they are completely impossible to cover, even when they are selected as the target player and covered by similarly elite CBs. The coverage system is much better, but the actual results of coverage fall off a cliff once the receives reach a certain quality. Even Randy Moss, Jerry Rice, and (except for one year) Calvin Johnson never played at that level. 131/128 yards per game for two different receivers in one season is just crazy.
sorry to rant but its pretty frustrating to watch teams get completely torched like this every single game with no effective counter options. Not to say I want these receivers to be useless, but In my opinion as players we need options to atleast limit them when we see it coming and we have good Secondary players.