In a medium bowl, whisk together the miso, soy sauce, chili-garlic sauce, sugar, sesame oil, ginger and garlic until the sugar dissolves. Measure 2 teaspoons of the mixture into a small bowl and set aside. Add the steak to the remaining mixture, turn to coat and let marinate at room temperature for 15 minutes. Meanwhile, to the reserved 2 teaspoons, add the vinegar and 3 teaspoons of the oil. Stir to combine and set aside. Remove the steak from the bowl and pat dry with paper towels.