Hmm, interesting that it only happens when you move your arm slowly. This could be due to a few reasons which would take a lot of explaining in this post.
My suggestions are to continue your gym program if it is really only 1% residual pain as you described. Focus on good shoulder position and technique, continue with the exercises the physio gave you, stop any aggravating activities as soon as you feel them (can try dropping weights if any of your gym exercises provoke pain, if pain continues cut the exercise), and if following a few more weeks you still have the 1% pain, go back to your physio. He can assess how things are coming along and give you further advice. I strongly reitterate not to continue with any aggravating activities however, even if it is only a slight discomfort, as the last thing you want is to be back at SQ1.![]()
Hope it helps, if things get worse / pain is still an issue in 2 weeks. Let me know as well, I will try to help out!