I would contest that the best players very, very rarely have off days. If you can't control the level at which you play, you'll have difficulty showing up to tournaments strongly. The more circumstantial problems you have to overcome in a single tournament day, the more likely it is something will be able to throw off your game.
Instead, Koopa, I would offer that you should find a way to focus your ability. I've personally found that pretending to be mad (lol) lets me play really, really well, whenever I want to, and tap into adrenaline better.