I am aware of this issue (direct relation between pass speed and pass accuracy) for a long time. I have settle for pass speed 50 because it's somewhere in the middle between realistic gameplay and realistic stats. As I see it, it's impossible to get both. If you move sliders towards realistic gameplay you will end with unrealistic stats and vice-versa.
Today I played Man Utd vs Cambridge Utd for hours long, changing shot error, Gk ability and FT control looking for a realistic goals/shots ratio. Got nothing... I wish we could have separated sliders for both teams playing CPU vs CPU like we can on User vs CPU. It would make this much more easier...
I will be travelling for a month. So, no more FIFA 17 for a while. But, I will be releasing new videos of my Wolves CM for those who are interested.
Keep the good work! I will be around helping, if I can.
Cheers!