Managing Barcelona and it's fluid.
I don't know but it feels like you have no absolutely no control over the games, either you win 9-3 or lose 5-0. Usually have around 40-45% possession as well which feels kinda dull.
After your comment, I have tried to start with Barcelona.
I started at August 7th, so I did not even have time to have some friendly match in order to increase the tactic familiarity.
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I just plugged my tactic and started games.
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At home, I just smashed Madrid even though tactic familiarity is about a half.
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At away, even though Messi was injured at 37 min, I won.
Fm could give some different results every time we run. All of us already know this.
However, I have never seen very bad results like you mentioned even though you manage a big team such as Barcelona.
Check some tips in main thread.
You can also refer to how I place Barcelona players for my tactic.
By the way, this tactic does not give you a lot of possession for win. This one promises you a lot of goals.
If you want high possession tactic, I suggest you to find anther tactic.
Thank you.