I'm 31 and injured it about 2 years ago. It's bursal side, how about yours?
I think I've learnt my lesson and can tell how much soreness is enough to stop an exercise or activity. So having an injury of this magnitude is probably a good thing to prevent something worse in the future. As for healing, maybe we're just strengthening around the injury to take more and more stress off it and onto other parts, to allow it to rest that bit more to recover. I wonder: if the pain/ache dissipates to nothing, does that mean the tear has closed up? Or is it possible for the two ends to be too far apart to ever meet up again? Interesting.
I feel that working with free weights is actually more beneficial for rehab overall than bands. You don't have to stabilise a band, you just pull it, but with a dumbbell, besides pulling it, you have to control in 3D, which involves so many more surrounding muscles. The trick is to align your body so you can use gravity on the dumbbell in BOTH directions of the arc when doing rotations. Look at this image of rotations performed and note the man is "pulling" the weight even when he is lowering it:
http://www.myogenic.de/gfx/cpress.jpg To "push" the weight he'd need to be upside down or at least on a decline. Something you might know about, otherwise to think about.
On these 2 types of rotations (dumbbell pull and push) I normally use 2.5kg, sometimes heavier, particularly for partials. What kind of weight are you using? Besides this I do shoulder rolls and big straight-arm circles like butterfly swimmers. Otherwise general weight training. How about you?
Have you ever had anything invasive done? How about anti-inflamms?
I looked at your stickied thread on rehab exercises...
IMO:
1) I don't understand all of them. More videos/images would help.
2) The exercises shown in the images are good. I did these as a beginner but the true external rotations are the real deal, especially with free weights. This is what I call an "external rotation", maybe you can give me the correct term:
http://www.exrx.net/AnimatedEx/Infraspinatus/DBUprightShoulderExtRot.gif 3) You wrote: "The supraspinatus is strengthened by holding out your arm straight in front of the body, with the thumbs pointed toward the floor.": I believe this causes impingement with the thumbs pointed down and is to be avoided. But pointed horizontally or upwards is fine.
I've tried pendulum swings and don't feel comfortable... feels like my arm is going out of it's socket... dunno what else comes to mind...
I'll try to read them more closely again to better understand them and comment later. I'll write back soon.