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You got your procedure a little out of phase. Typically, you don't draw the large circle until after you've fired. The large circle is then drawn around the densest concentration of pellet holes. Then you divide the circle into quadrants and count the holes in each quadrant. The count can give you a percentage of hits in each of the quadrants. From this, you will learn where the pattern center is in reference to the aim point and if the pattern density is uniform.
In an ideal world, the point of aim and the center of the pattern will be concentric and there will be 25% of the pellet holes in each quadrant. Shotgun reviews will often include small graphics depicting a circle divided into quadrants with a number in each and an indication of the aim point.
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