Beating Easier Teams Comfortably (5+ average quality Higher)

So I've been having trouble beating easier teams, even using formations to stop their attacking threats i.e. Dr/DL to stop AML/AMR and DMC to stop AMC, yet they still seem to score and give me a hard time. I even lost a cup game against a team that was 10+ quality lower. 3N 2-1(AMC)-2 I played 4-5-1V and lost 3-0.

It it just luck does the game sometimes just through random results out there? or should i have used different tactic than normal, counter on? i.e. Whole pitch pressing, hard tackling?

5+ quality in upper levels is not that big gap : ex: QT 60 vs 55 = meaning he is 91% as good as me .. but Qt 17 vs 12, means the other 70% as good as my team ..

so it is variable you can't limit to 5+ as the higher you go up the less this 5+ means

Ok, I'll be more specific then my team quality is at 26 I'm Level 2 Manager I played a Lvl 5 Manager who's quality was 19 and I lost.

There have been other instances where I've played a 13 Quality and only manage a 1-0 win.

It's just how the game engine works.