I hear you

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I actually find that no-one knows how to edit sliders at all. All of them are trial-error thing.
Thus why there is so much variety in those...
However, I found something is fishy.
I lowered Pass and Shot error for AI to 25 and 40 respectively. Then put sprint on 0 and acceleration on 41.
Put the pass speed to 40. Run frequency to 0. Marking to 80.
All for AI. Lowered the Width, Length and Height sliders to 30 for all. Fullbacks left at 50 and First Touch Error to 30.
Goalkeepers left at 50. Injury Freq on 80 Severity on 45.
Like I said, ALL FOR CPU.
Then went to watch AI vs AI games unfold on Legendary difficulty, Normal Game Speed (IT'S A MUST with those sliders).
If you want to see what it does... Try it.
I found passes are misplaced, shots do go astray, the game has more realistic, down to Earth pace, the AI passes the ball around in midfield and defenders more, they do play according to CTTs they have set by EA Sports.
This is the most amusing thing I tested and tried in a while...
Actually who would have thought that watching AI matches could be fun? O_O
I think I have AI sliders nailed now. Should be hard to beat, but not impossible

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This little experiment proved worthwhile at least...