Doc,
Sorry for the delay in responding to your post. The best thing to do is match the angle on the knife from the factory. I am not familiar with the Spyderco 204 system but what i have learned from the "Lansky" type is that the settings do not mean much. THey will give a diferent angle to every knife depending on the geometry of the blade. If you find a setting that matches the factory edge, and use it everytime, you should get excellent results.
Hope this helps,
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Joe Houser
Director of Consumer relations
Buck Collectors club Administrator and member #123