FWIW I'm not trying to say the Crossover symmetry stuff isn't good, or that it's bad. I've used variations of all that stuff before. Imo it probably works because you're getting the person to move their shoulder blades with repect to their torso. That said, the shoulder blades still have to move
on something, and if that something isn't shaped in a way that "fits" them, they won't move as well, and they won't have a stable surface to find purchase on. I guess I'm just used to seeing the focus being on the upper back, meaning, "the area between the shoulder blades." I still stand by the statement that
over -focusing on that will compress that area. That area needs to be widened and opened up for the scaps to move well.
I also had a thought in general about "overhead positions." The overhead position in a barbell snatch is significantly different from something like a handstand, which is different from a unilateral press (like a KB press). From what I can tell, Oly lifters end up with something of a "head forward" position, which puts the bar kind of "behind" their head/neck. So it would make sense in that context that the upper back does more work.
This shoulder position. . .
View attachment 23394
Is a lot different than this shoulder position (I searched for "kettlebell press" and this image of Aleks came up). . .
View attachment 23395
The Oly lifter is more internally rotated (intentionally so, according to the article), while Aleks is more externally rotated. The internally rotated position is going to involve the upper back more. From what I've seen, a double KB overhead press usually ends up in a more externally rotated position as well. Look at photos of people doing kettlebell snatches and you will see a similar position to that of the Oly style.
The point here is that the OP has overhead position issues, and the way he does his overhead work probably plays a role in how/why it hasn't seemed to work out for him. @Brak if you are up for it, a video of your form would certainly be helpful. Please don't feel pressured, however.
I've posted this article before. It's worthwhile to note the emphasis on the ribcage throughout it.
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And for reference, the image of Aleks is from his Medium article, " #1 Bodyweight move for a bigger kettlebell military press." For some reason no amount of copy-pasting made the link copy right