As I wrote in another thread (this season my league is full of (reallife)friends):

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First two friedlies against my wife. Both teams were full rested/moraled in both games. Both times it was exacty the same formation/tactic. We didn't use bonusess.
My team was ~120%, her team was ~100%. Both games were exactly the same. If wee just know... this is a computergenerate game, how is it possible to get to different results?

Second were her brother (also ~100%). I lost both friendlies (both full rested/moraled), no tactic/formation change, but we used bonuses. But I won League games clearly. How and why?

There have to be a randomfactor - but how we should manage teams without this frustrating impact?