I agree, I don't know what they do for some of their sleeker lasts (U,K) as I do not wear those, probably a thinner lighter tool..anyway doesn't really matter.I'd like to know how your stitch prick works to reach under the vamp with the last on specially when the welt is thin? Is difficult work I presume.
I took a close look at all of Vass shoes in this design and they seem to have the stitches at a even distance from the out sole edge. Call it skill or experience or maybe both. All my shoes are made by only one person at Vass and I have heard that he is one of their best.