One issue I have noticed with the Rundschau system of this era is that the shoulder seam is a tiny bit slanted backwards on the bias. This is likely a relic from older version of the system, in which the seam was even more on the bias. I find it best to complete the pattern according to the above system, and then advance the back shoulder seam forward by 1.5-2cm or until it runs down the middle of the shoulder. The back neck will also have to be widened by 1-1.5cm (and the collar seam of foreparts reduced by the corresponding amount).