I understand your case is different because of the surgery, but if you can do get a full body eval by the PRI guys since you are in the US. Or somebody familiar with scoliosis. I suspect your dysfunction (as is that of most of us) is muscle imbalance patterning that makes you overuse certain muscles forcing the pec's to tighten up and clamp on the nerves.You need a postural evaluation and then a fix, opening up your posture.