Inmate:
I’m feeling helpful today…so here goes:
I can relate to you about your dislocated shoulder, I’ve dislocated my left 9 times in eight years. The back picture of you clearly shows a discrepancy btwn the right and left. your right shoulder is obviously lower and your right arm is held more lateral than your left. If you also compare the upper left trap to the upper right trap you’ll see the right is longer than the left.
Coming to the side views, your shoulder girdle is protracted quite a bit and standing you lack lower ab tension. I wouldn’t be so concerned with your upper chest, i’d be more concerned with your mid back, and rear delts, and external rotators. You see how from your mid back up it looks like one long curve up to your neck? that ain’t good man. From the side pics it appears as if your standing posture depicts an anterior pelvic tilt (strengthen lower abs and glutes).
Re-looking at the front pic i see you are tilted in your torso to the right. If there is a qualified practicioner in the area who can assess your posture I am confident they would find your right lat. dorsi is tighter than your left and there is also more tension in your right trap then left as well. There may even be a tension imbalance in the quad. lumborum right vs left. I presume you are right handed as well, but that is just a shot in the dark.
What to do…like someone already suggested, read the Neanderthal No More series. Cressey did a great job with this series and it will help out a great deal. You seriously need to forget about bringing your chest up and focus on strengthening the backside of your body, lower tension in the muscles which are tight, and get the point where range is even or at least close to each other right vs left.
You are only as strong as your weakest link and your time in the gym is a small amount of your day. How you sit, sleep, stand, walk, drive, etc. ingrain patterns into you without even knowing it.
Hopefully this can help out a bit, good luck with resetting your holding patterns. It may not be the funnest thing or easiest thing to do but will pay for itself over time, I GUARANTEE IT!

