I just tossed a Crystal today after 4 uses. Its first shave was in my ATT M1...very nice. I’m just looking for something new. I have a couple of every blade sold on “try a blade” or “razor blade club”. Whatever... I have pretty much any blade someone might mention. It’s either that or I reach in with my eyes closed and suffer whatever comes out.
Perhaps you should try a Nacet, personna med preps, bic chrome plats, or anything on the sharper side since your m1 is so mild.