I received the 600, it's really great!

However, I also received a very problematic Clauss 6/8 that's giving me fits! I reset a bevel on another razor no problem, but this one is just crazy. 2.5 hours and nothing, nada, all polish and no bevel. It came with not much spine wear, but a bit of an uneven heel. I've tried 600, 1k, pressure, no pressure, this razor won't take an edge. I thought maybe the blade was warped, I tried a rolling x stroke. Nada, zilch.

This one puzzles me bad.