I think this says it all. If you do the exact same thing every time you will get the same outcome. Whether you use different equipment to force yourself to adjust, or keep your equipment the same and try different techniques, you can improve through experimentation.There are all kinds of theories about how to get a perfect shave.
They all are correct . . . to some people. None are correct to all persons.
So what does that tell us? Personal experimentation is the key to shaving success.