Can someone explain to me why Saber-ground blades seem much harder to sharpen than FFG blades? I have 4 carry knives I rotate through - a FFG Endura, a SOG Flash II (also FFG), a serrated Endura (saber), and a PE Endura (saber). I use a sharpmaker on all of them. I can get the FFG Endura and Flash II hair shaving sharp in a few minutes. Serrated edge knives I find easy to sharpen on the SM regardless of grind. The saber ground PE Endura however, is much, much harder to sharpen to an acceptable level and never seems to get as sharp as the FFG blades. I have noticed this on other saber-ground Spydies i've owned in the past.