Hello, I have a novice question. Do different blade brands cause some guys ingrown hairs? I am experiencing ingrown hairs with both Feather and Lord Platinum blades. I am using no pressure with sufficient prep. I have heard a theory that blades known for extreme sharpness can cut hair follicles differently or give a guy too close of a shave causing ingrowns. Should I just move on to milder blades such as Derby or Crystal? I use a mid 1960's Gillette Tech.