Toile fitting on my measurements

Hi Rory and HTAers

I have completes a Coat pattern based on my measurements. I have an erect posture and my right shoulder blade protrudes. I have made a toile and, though it is not fully edged, I can see that there are two diagonal lines from the top of the vent toward the neck. I have had a look at some books and this is suggesting a "stooped posture". Have i gone too far with correcting for the erect posture? The arm scye fits well under the arm pit. What is the correction for this? Is it providing say 3/8" at the neck of the shoulder seam back to nothing at the arm? The front looks good though Thanks