You would need many stones to duplicate 7 sheets I would guess.I'm finding that the best edges I get do not make up for what I'm lacking in shave technique. They said it's hard to learn to hone and shave with straights at the same time. The shave test has shot me down a few times. Usually it's a smoothness issue rather than sharp issue. I recently shaved with an edge I had worked through film. So sharp and smooth. Funny that I can't get exactly the same on natural Stone progression . I get close though. I think you just gotta keep at it. Good luck