To give a little more info on the cup walking, think of it like a sewing machine stitch that is zig zag and the tighter the pattern the higher the heat will be. You just advance forward faster to run cooler. The next is always have the tungston perfectly sharp at all times. The second that it gets any contamination on it stop and re grind it and fix the carbon where you quit welding before restarting. This will give you more focused heat and more control of where the heat is going. As for the stick out, If you are using a #8 cup do not exceed 3/8" stick out. You will get porosity in the weld if you get out of the gas shield, and set the gas at 20 cf on the menometor. A little higher is ok but too low is fatal. Have fun Mark
Bruce