There are a few issues that I see from viewing the newer set of photo's.
You will notice that the right shoulder appears to be higher than the left shoulder.
The right sleeve is shorter than the left, due to the right arm length being longer than the left arm.
If you notice the jacket is being pulled from the higher left to the lower right at a slight angle.
I also see some balance issues with the jacket. The sleeves need to be moved/rotated forwards slightly. Mark the original positions first before you do this.
The shoulders appear to be slightly too wide and drooping, causing the issues below the arm.
The missing shoulder pads and extra sleeve head may exaggerate many of these issues. Your draft accounted for shoulder pads which are now not present.
If you plan to install shoulder pads, you may wish to try another set of sleeve heads that are not so thick and see how they affect the sleeve afterwards.
First, keep it simple, look for easiest ways to attempt to resolve your problems.
King's book identifies many issues and solutions relating to lateral and vertical balance. If you can find this book, this will help you very much. Why re-invent the wheel?
I would recommend tacking some shoulder pads in first before attempting any major alterations and making greater issues.
se a thinner pad for the left shoulder and wider for the right shoulder, afterwards you may view a big difference. See how this affects the jacket before pulling everything apart!
I also wanted to ask if you did any stretching or shrinking of the cloth during construction.
I hope that this helps you!