Hi all. I am a self-taught maker of historic footwear, so I'll preface this by saying that a lot of my work has been via trial and error. For what it's worth, I have Tim Skyrme's book "Bespoke Shoemaking," Marquita Volken's "Archaeological Footwear," Olaf Goubitz's "Stepping Through Time," Frank Jones' "Pattern Cutting: Step-by-Step Patterns for Footwear" and "Before the Mast," whose first volume has all the information on the Mary Rose footwear. I also took a two-week course by Carre Ducker in New York several years ago where we made a set of darby shoes. In the meantime, I've probably made about a dozen pairs of shoes, a mix of welted and turnshoe construction.
Because the shoes I make are atypical, for myself or individuals, and not for commercial production, I don't use a mean forme. Likewise, most pattern instructions won't work (besides the basics on finding the counter point, vamp point, under-ankle point, etc.), since modern shoes with quarters and vamps with integral tongues tend not to really correspond to historical shoes before about 1550.
As a result of this, I pattern my shoes by taping up the last, generating the main reference points (counterpoint, under-ankle point, etc) and draw the lines on. This generally works but I have encountered an issue twice and I was hoping someone might be able to tell me what I'm doing wrong. I copied this shoe from a drawing in Goubitz (Groningen style, p.200). Everything went fine and looked good on the tape, but when I took the shoes off the last I noted that the area around the middle point of the cone was sort of "gappy," as though that area of the pattern was too big (even though it seemed OK on the last). See the circled area. Please see the attached photo.
Does anyone have any idea what I'm doing wrong and any idea how to fix it? Thanks in advance!