Cooking time looks about right, maybe it will take a little longer. You do not mention where you are measuring the IT: 163 is fine for the breast meat but too low, imo, for thigh meat where you need to see about 170. Searing/crisping time depends entirely on your gasser. I do mine on a TEC infrared grill which is extremely hot and simply leave the lid open and watch it, just a few minutes a side.