Something to keep in mind is that even emphasizing pulls will cause impingement if care is not taken to minimize internal rotation during pulling and focus on proper retraction with external rotation. Many, many people do not realize this.
Flexi, your FL is not retracted. Try starting from an inverted hang in the tuck, retracting your shoulderblades, and KEEPING them retracted as you lower down into the FL. Try and keep them retracted the whole time. Consider that your current position is putting more pressure on the AC joint, and that may be part of what is aggravating your shoulder. By retracting and keeping the scapulae retracted you will not only protect your shoulders from unnecessary pressure around the AC joint but also build teh strength you will need for later progressions.
Once you have chronic inflammation, it can take 6-12 months to clear up once you stop aggravating it. Seriously. If you don't have access to electrotherapy treatments, really good cryotherapy, NSAIDS, and/or infrared or ultrasound therapy you will have a hard time getting rid of the inflammation in just 3-4 months. The inflammation is by far the part of injury that takes the longest to go away, and that's the way these things are. I mentioned this recently in another thread, but please feel free to research this with surgeons, especially cosmetic surgeons. They will tell you that post surgical inflammation takes 6-12 months to completely clear up, though quite a bit is gone after around 4 months.
Knowing that, and considering that with plastic surgery you are just traumatizing the area ONCE, imagine how much harder it is for your body to get rid of inflammation in a shoulder when you're constantly using it. It can be pretty darn tough, and without a combination of effective treatments together for long enough it can take many years or even become a nagging pain that follows you forever. That is a pretty crappy fate in my eyes, so I believe in handling this stuff more appropriately and dealing with the annoying time off.
