Your #2 is not part of patterning, and #3 is covered by your #1. What was left out was the most important part of the patterning process: pattern distribution. Having a high pattern percentage is not much use if the pattern consists of holes and clumps of shot. A evenly distributed pattern is the most important part, providing your load and distance provides sufficient density. That's why getting only pattern percentages is pretty much a waste of time; it leaves out the most important aspect of a shotgun pattern.