Fitting the sleeves – Muslin 5 questions

#1. If I am starting from a size to fit my upper bust measurement and grading to larger size for waist and hips ( say size 6 D cup going to a 12 for waist and hips) and doing a full arm adjustment to add about 1.5 inches, do I need to adjust the armhole also? Or should I start with the armhole as is in the smaller size? #2 Would the Bistro dress pattern be a good one to use to make a “body map” in muslin as described in Fit for Real People?