These frowns or smiles and bendings up or down confuse me. Are you holding the razor head up or head down? FWIW, when I tighten the head per usual, hold my Flatboy head up and look at it from the side, the blade is curved up in the middle and down on both sides. If I tighten the head more (too tight for me), the curve increases.My Razorine frowned in the other direction though, rather bent down in the middle than at the sides.