I recently bought a Cushion strop-back hone in good condition from an online auction site. Lapped with 800 grit wet sandpaper and tried it out. Honed 3 different razors to see how different razors react to the hone. I couldn't shave with any of them, not even close. What went wrong? Should I use a higher grit sandpaper? I used water on the stone, do I need to use oil or lather? Or is it simply not a good stone?