This is what I have noticed from personal expirience from the last year until today. I’ve never had any shoulder injuries (knock on wood), I don’t train people for a living, and I am no expert.
Still I hope you find this useful. (note: all the pressing I do is standing)
I see people tend to use do overhead pressing a little mest up.
-You can see that the bar is infront of their head, or at best right above it. This means that the weight is being supported by the front area of the shoulder.
-NOW, if you see the above video the bar is held BEHIND the guys ear, even behind his head. You can also see this when Olifters do a Jerk, their arms are behind their ears.
-And I’ve noticed when I do Jerks, Presses, and Overhead Squats (1) the arms are behind the ears, (2) the traps kicking in as the scapulas retract and lock (3) I feel a little “sweet spot” where you are solid and the weight feels very light.
HOWEVER, that is an upper back flexibility issue. I used to not being able to get on this “sweet spot” as my upper back flexibility was very shitty. And, everytime after I did front squat, or Clean & Jerks my right shoulder would be in pain the next day. In my view bad upper back flexibilty is the issue here for most people. Thanks to all the benching people do.
To test for this do a press (or overhead squat) with a snatch grip, and then try to do it with a clean grip. You will see and feel the difference.
I would suggest using a broom stick and do “shoulder dislocates” every day. Wall slides tend to be a pretty good warm-up, I’ve felt very good after doing those. Also workouts like pushups, pull ups/chin ups, and hell even light overhead squats for reps will help. At least they did to me.
Currently I am doing 2-3 reps of Overhead Squats with a Clean grip to improve my upper back/shoulder flexibility. (As will be Squat Jerking for the next competition instead of Split Jerking) The 1st time I did those a week ago, I felt my right shoulder do a little “clucking” sound as the it drifted into position behind my right ear. Yes it sound dangerous thats why I take it easy with those.
my 2 cents.