Chronic shoulder pain has been an ongoing issue for me that I don't think is ever going to go away. I've taken time off before -- enough time that I had no pain at all. But as soon as I go back to tennis, the pain comes back.
PT has never really helped either. It seems that all I can do is try to space out how often I play and choose equipment that is more forgiving.
I can't help but notice though, that while shoulder pain is not surprising for me (regardless of racquet), it feels particularly painful after 2 outings with the 320X. It hasn't felt this bad in quite a long time (and I had been playing roughly 2 times a week w/ the Fischers before this).
I may give some lead at 10/2 a try.