I am also blessed with a noisy shoulder. It doesn’t like slow pulls and holding at full draw. Turned me into a snapshooter by necessity. Still trying to master this, sure is quick though.
And try a few dowels from the hardware/lumber store. Some of those worked as well as anything else launched from a 55 pound Montana.
“…Super Diablo that has always been point on at 55 yards and is now shooting about 5 yards lower.”
It’s trying to tell you it can’t take it anymore.