tight lats....
try regular practise of the reach,roll and lift move in that shoulder article
And the arms over the top thing on a chair and foam roller
and that tricep/lat stretch where you bring the arm over the top and pull with the other arm, while leaning over to one side to really stretch the lat/serratus and side of the torso. Use a wall for support.
I also hold a chin bar one hander, feet on the floor, and pull the arm in the same direction
plus when your in the shower, trying to soap your back, use the wall for leverage and force it over
That takes care of the static stuff. For dynamic stretches I just swing the arms over and try and touch the base of my neck/trap. I do these in my workout warmups - it's like a vertical jump armswing
I do all of these, and just keep practising that test, it's stretch in itself