Not too long ago I discovered a diamond plate that's better than DMT or the regular Atoma. The brand name on the label is Ken-syou but I'm fairly sure Tsuboman made it because the diamonds are arranged in exactly the same manner as the Atoma plates. It's quite a bit faster and the channels make sure the stone material is easily washed away. This plate is made specifically to flatten stones and it's available in 400 and 600 grit.