I just finished a jacket using my new dress form and I am not happy with the fit across the back and upper sleeves. The jacket fits the form perfectly and fits me perfectly until I cross my arms in front–then it is snug in the upper arms and the arm pit seems to be too low under my arm. So I remeasured the form and found that while the bust is the correct size, the measurement of my upper chest, under the armits is 2 inches too big on the form. There does not appear to be a way to adust that. The form I have is a Dritz: My Double. Any suggestions?