Yes, and I wish the words were good for explaining this movement, but even with the best words and visual I've found that it really helps to have someone in person poking to make sure you have the shift correct.

One thing you can try it:
put one arm out in a goal post (right angle to the body, right angle at the elbow).

Pinch your pectoral attachment at the armpit and feel it tighten as you move the arm from your side to in front of you. So that muscle in engaged.

Then make sure you trapezius and latissumus dorsi are pulling your shoulders together and down. And keep those muscles engaged.

Then while keeping all those muscle groups engaged, push with your elbow in front of you - as if you were moving your whole arm forward, but without getting the shoulder blades out of place.

Then we do that on the other side, and then we hold a block between both elbows and press together and forward - all without losing the shoulder alignment.

Then for downward dog or dolphin, not only are you thinking about the tuck of your hips and lengthening the rib area and having a straight line from torso to arm and all that business, but also you think of the shoulder wrapping as the muscles you're familiar with being engaged and that resulting in a lifting of the thoracic vertebrae between the shoulder blades. Sometimes the correction will be the teacher placing a hand between your shoulder blades and having you push into it - without pushing shoulders up or away or out of place. So it requires constantly checking back in to make sure your good. But it protects the rotator cuff in those poses, which I think was something you mentioned as relevant to your practice.

And thank you for posting so many interesting articles to this group. I would not have written this post had you not inspired me to do so.