I went to a physical therapist a few months ago and they showed my 2 exercises to strengthen the inner muscles of the shoulder.
1) Hold a length of elastic in one hand behind the back (the hand with good shoulder) and grab the elastic behind back with the other hand (bad shoulder side) and pull until arm is about 45 degrees perpendicular to body.
2) Place both elbows on desk in front of you with forearms pointing straight up, palms facing body. Grab elastic in both fists and pull.
These exercises did not help in the slightest.
Also try lean against the bumdbell rack with you back parallel to the floor, hold a 20-25 lb weight in one hand while hold on to the rack with the other(stabilization), let your arm hang towards the floor completely relaxed, swing the weight in small circles like a pendulum, your arms should not be twisting at all, if your shoulder is relaxed you will feel the pressure pull your shoulder joint apart just a hair. Swing each side for 15-20 seconds a couple of times. Helps to take some stress of the joint and reduce the pain.
I've been doing this without weight after any set that gives me pain. By the way I don't have access to a lat pulldown pulley. I go to a gym once a week but it's old and all the machines are stone age stuff. I work out at home with a simple bench.
Built, I live in rural Japan and I have yet to find any rehab place or orthopedic hospital that can help. The surgeon butchered my shoulder 10 years ago after the snowboard accident that caused teh separated shoulder. I have no ligaments attaching the clavicle to the shoulder apart from the one that about 3-4 inches from the end (corococlavicular). The acromioclavicular ligaments are gone as is the cocrocoacromial. It's the worst kind of separation you could ever have.
I'll try the corner press with better form. I know for sure I was just throwing it up there and not pulling the shoulder back and engaging the lat.
Thanks for teh advice, I really appreciate it. I've also fucked up my right groin kickboxing and can't do any leg exercises right now. The injury looks deep and judging by all the nasty clicking in it from when I did it originally (6 months ago) looks permanent without surgery. Getting old sucks (I'm 39 btw).