Depending on the lighter, you can hold it as far as 6 or 7 inches from the foot and still get the tobacco to glow. You don’t need to get so close when toasting and lighting. You want even heat, like you would use when cooking. Therefore, I suggest lowering the flame a bit. Not only can you keep it a little closer to the foot when toasting, you’ll also have more control.
One of the first rules of toasting and lighting premium cigars is to prevent the flame from touching the tobacco. That’s one of the advantages to using a torch lighter in the first place. However, since you’re dealing with extreme heat, a more measured approach will get you better results.