Good question. I go from side to side and front to back and once my tone drops off I note where on the ground it did that in both directions. I have a screwdriver type tool, which I also use to pop out shallow targets, and put that in the location of my target until I can get down on the ground. I then take my pro-pointer and see if I am in the general area and I am usually spot on, now I either pop it out or dig a clean hole. After you practice with your machine you will learn where the sweet spot is on your coil and that will be the spot where your target is right underneath it.
I use both the stock and the smaller 8.5 x 11 and I can get the target with each one, no problem. I always lift my coil only if I have a feeling I am not on a good target. If I still get a strong signal when I lift my coil off the target I know I probably got junk.