I put WRC at 25, PRC at 5 and PCV at 95 and everything is fine. RGIII recently threw for 62%, so I'd say that's pretty good. Although there were drops by Alfred Morris and Jordan Reed, Garcon and Jackson didn't drop any. Also with PCV so high and Grounding at 0, the QB will throw the ball away under pressure and defenders will defend the ball, batting some down. There are also overthrows and such. I haven't seen a lot of problems besides the disparity from great QBs and poor QB's not being that great.
Try QBA 65 and WRC at 30, it's a little better but QBs don't act as aware as at 75.