From what I've learned, it's not uncommon to have residual pain in the same TOS places for awhile post-op - some people have it up to a year, some only have it a few weeks post-op - it takes the nerves awhile to settle down after the trauma of surgery, and you have to learn how to use your body properly, as you've probably been holding it in a weird posture for a long time either to avoid triggering the TOS or b/c the muscles/ribs/scar tissue/etc in that area forced your body into weird posture. Have you started PT? That may help.
Happy New Year, everyone!