For temperature, it’s often easiest to go on vibes instead of temp - thin pieces are often cooked as soon as both sides are adequately charred, you can cut and test the thicker pieces.
A good accompaniment is a simple salad: finely chopped lettuce and onions, grated carrots and store-bought dressing. Optionally put it in a covered container / ziploc for ~30m, without the dressing, to let the onion & carrot flavors to get into the lettuce.
Cold leftovers can be used to make a great chicken sandwich: white bread, lettuce, american cheese, and mayo. It prefers bland ingredients because of the strong flavor of the chicken.