Results: my team lost the match 3-1 (5-1 on aggregate).
Narrow diamond did not work. I changed the formation to 4-3-2W-1 in the second half, and my team managed to score one goal.
The way the comments were going on, it seemed that the results for both legs were already decided before the matches started.
I have decided that I will no longer buy tokens; it is not worth putting money in this game.