Struggling to defeat a MUCH weaker inactive opponent

[iSusel]

This was my first cup game after moving to lvl 2.
The opponent was just a fresh team that was created 2 rounds before the end of the season and won the league somehow! The screenshot after our game:



The powers were my 71% against his 39%, I had 10% all bonuses, my team was 90%+ condition and I was watching the game and adapting the tactics... what could go wrong?



I had the bar constantly around 75% in my favor, but I didn't mange to do anything to make players actually shoot on target.
Looking at games like this makes you feel helpless...

Today my lvl2 friend also had a very familiar cup game:
75% power well prepared (not fully rested, though, but 70-80% condition) team that have just crushed an equal opponent in league 8-2, but wasn't able to do anything against 54% power team and ended up 1-1 (which was the 1st ever draw after 23 winning streak).

I won the 2nd leg of mine (also was 0-0 for the 1st half, but ended 4-0), and hope my friend will also do this, but I wonder, if there's some technique to turn the gears if you see the engine not wanting you to win against all odds?