I think you did get a bit lucky in places winning a majority of your coinflips, however this does not mean that post flop aggression is detrimental to your game. I personally am very agressive post flop (and when not playing on PKR i'm very agressive pre-flop). In MTT's its all about picking your spots. Be agressive when you have a decent holding but be warey of re-raises. Agression post flop is good and i tend to raise most unraised pots if in position. Although i think you did get a bit jammy, opening up to more post flop agression can only help your game (don't go mad though :P)