Anyte, there's a lot of, um, excrement masquerading as shoe polish on the web. I still think its better to look for information and fail before asking questions.
Rich, thanks for the comments. Why do you think I recommended (in alphabetical order) Blaker, Bracegirdle, Gibson, and Lefkowitz? All present the magic formulas clearly. The beginner's problem, after seeing them, is internalizing them and applying them as required. This is independent of format.
Robert, Rich, much of what's been written about closeup photography and photomacrography is couched in terms of 35 mm equipment. Shaw, in particular, is Nikon-centric to a faretheewell. I use Nikon gear, even so find his focus on it counterproductive. In her book on closeup work, however, Heather Angel also discusses her work on 6x6 using, IIRC, a Hasselblad. What I've done, and you should be able to do too, has been to extract the ideas presented from their (sometimes) 35 mm-centric context and then apply them to larger formats. 2x3 in my case, larger and harder to use in yours.
Ted, as usual I agree with you in principle but not in every specific. I'm glad you mentioned Image Clarity even though I see that book as more about good practice and practical limits to what can be accomplished than about photomacrography. About the "very specific technical issues that apply only or more usually to LF," well, I see most of them as obvious to a thoughtful person who understands the basics. For me the key is understanding the basics and reasoning from them. But you may be more nearly right here than I am.
One general comment. Its wrong to restrict discussions of technique to a single format. APUG is visited by people working in all formats and is not restricted to people working in formats larger than 35 mm. The LF contingent shouldn't forget this.