I think the variantions on "W"s depend on the method of forge welding. Toby probably used his power hammer more than press. I used only press, so that the deformation on layers are more intense just on first weld (i guess). Also, I observed that if your starting steel sheet are thin, the less welding steps will be necessary. So, take a look what occured after the 3rd weld from starting. In my work condition (23 layers of alternate 2mm 1065/15N20), I´ll stop the next 'w' on 2nd weld before forming the cube for the "V" cut, otherwise the feather will be excessively thin.
I don´t know if your question was to Toby or to me. Anyway, the link below will be useful.
Many thanks to Mr. Rick Dunkerley, Mr. Don Fogg (I bought the book), and Google to save me from any copyright problem!!