I do wrong things all the time. Even when i'm giving my full concentration. Usually I start relaxed and end up way too tense and concentrated the deeper I am. At some point, I will overthink something and fold the best hand. Come to think of it, this happens way too often... I will have to work on that!
how to develop concentration?
I find myself concentrating more the deeper I get in a tourney, probably because I have better reads on my opponents further in.