Happy about it. As long as you haven't purposefully set your set pieces as a corner exploit - or downloaded a tactic with it - then it's not cheating. You are just taking advantage of set pieces! (Quite an accomplishment baring in mind how sh*te we are at them in real life! )
You do have a few strikers and attacking players there for instance so you obviously rotate your squad a lot, i play Giroud upfront by himself so he would get a lot more goals than your one would as he has more competition and you have played Koscielny every game compared to some of the strikers playing half that amount