I'm getting quite the opposite results from what you are having Anna,

I find that going attacking makes me score more goals and concede less. The only reason I can think of why I concede less is that my team will be doing all the attacking and the opponent won't get an attacking chance while the clock ticks down as all the highlights comment chances are going to my team.

Everytime I go defensive or hard defensive I concede a goal... Despite blue arrows which I don't think does anything whatsoever.