After trying different stones to see which gave me the desired results, namely the removal of the heavy scratches from the kongo-do. The 800 grit is fast, but too hard a stone, leaving an uneven scratch pattern and too "bright" a finish. The queer creek stone was better, but kept glazing over and having to be resurfaced to continue cutting into the steel. The best stone I've found so far is the first waterstone I ever bought, a #1200 stone that I got from Garrett-Wade back in 1991. It's a relatively soft stone, but still quite aggressive, so it removes scratches and leaves a nice even pattern, and the mud it produces gives a very nice matte finish. The distinction between the soft and hardened steel, and a bit of the hamon, is coming out very clear with this stone.
Pics tonight, including some photomicrographs of the scratches and steel structures.