When you drop the shoulders, it might be interesting to play with the feeling of droping the shoulders "into" the elbows.
There's still a sliiiight feeling of tension in them as you try and maintain this feeling It's the difference between being relaxed & just "slack"
This is one of the points that always confuses me! Everyone says relax..relax..relax..but it seems to be so much more than that. There has to be the right kind of tension in the right places...and very relaxed in other places...and how the heck you maintain that under pressure I haven't a clue.