Broke out my nice new executive today. Set it on 4, popped a new personna med in and went to work. Three day growth, didn't change anything from my other shaves with my trusty 89L. Did not get a great shave in my problem area which for me is my chin area. Got some burn and I little blood. Do you guys think this is a learning curve with the new razor or should I take it down to 3 for now ?