The BBs are definitely a factor, that I take into account, when I am playing and also my stack size. At the beginning of a MTT/SNG with unkown players I tend to be more selective with my
hands and try to observe the game style of the opponents.
In my opinion it is also important to consider your position, when you play and also to know what kind of players are sitting near to you. Having a maniac near to me on my left lets me tighten up my game definitely. When having a nit near to me on my left it lets me open my range and I try to steal more. Later in a tourney I adjust my game also according to my stack size and the opponents stack size. For example, if I have good and healthy stack, I try to steal more from the others especially when it comes to bubble time.
If my stack is small like under 20BB I become more selective again and shove them. What is also important to my game style is the speed of a game, if I know it is a fast game, I open my range definitely more than in a slow game.
About tilt I have to say, I do not have this feeling anymore since years. Proper
bankroll-management helps to avoid this for me.