I've read some of the responses in this thread and TBH I don't think you need to really edit the ratings or change the schemes at all.
If I understand you correctly your playing CPU VS CPU
If that's the case the primary thing you would need to to do is lower the Player Speed Threshold.
The WR's don't get much separation with threshold up high and in return the CPU QB is going to throw to the 1st player he sees open and usually that's the TE on a higher threshold setting.
I understand some of the things that EA stated about threshold in previous years. But you have to ask yourself is EA really sitting around and testing their own sliders to watch a CPU VS CPU GAME or even HUMAN VS CPU GAME?
In theory some of things they've said from what I've read about The Player Speed Threshold all sounds good if it only effected player speed.
But that's most likely taking into account Competive Play only.
Threshold effects actual gameplay to....
I've watched and played games with a low threshold and the WR's have often gotten more targets without me changing a single Playbook or editing any of the TE's.
I'm on NG gameplay btw which may or may not deliver the same variables as Current Gen.
Here's an example
At the half of my game right now I have threshold at 25, QBA at 70 & Pass Block at 50.
The CPU controlled Jared Goff is 14/25-205 58%
His pass distribution is as follow:
Kupp 3-58 19.3 avg
Henderson 4-57, 1 TD (Screen pass that went for a 42 yard score to my surprise)
Woods 3-46
Reynolds 2-26
Higbee 1-15
Brown 1-3
I utilize the no switch rule on defense so even though this game is human vs CPU gameplay by me not switching off on defense it's very similar to a CPU vs CPU game.
But again even in watched games I'm getting the same results where the WR's are getting more targets than the TE's and I believe that is a direct result of a lower gameplay threshold that allows them to get open quicker.
Hope that helps you out.