Guilty as charged.
Nice to hear somebody else was at least aware of this. The experts I've consulted so far have said the problem is non-existent. I don't think I'd trust myself to do it by hand like you are though. I guess once the edge is SET you can use diamond by hand for SHARPENING only, which it sounds like what you're doing. But I do want the extra assurance that I properly set my angles with a file, once, before starting all that... and that is what a base tool supposedly lets you do.