Thank you, all of you for the answers.
Indeed I think I might handle the deck as too simplistic, rarely thinking about ideal play, sometimes vomiting to much overload.
Another explanation might be that I rarely play Shaman. For reference I have 20 ranked wins with Shaman, compared too 200-400 ranked wins with Warrior, Mage, Paladin, Hunter, Druid, and Warlock each, meaning I have more experience with those classes maybe (I play this game for 2 years now).
I will try to Improve with Shaman, maybe with a more Midrangy approach, or control. Thanks anyway.