I have only recently started shaving with a straight razor. I started with a disposable straight and now am using a Boker King Cutter purchased from Lynn. I know the razor is sharp because it shaves my face with ease. With either razor I have had trouble shaving the sides of my head where my hair is the thickest. I shower and use a hot lather before my shaves, but I never get a close shave on the sides of my head. The blade always seems to jump and struggle to move against my head. Do you guys have any tips?