Lightly season the top side of the shoulder with an additional 1/4 cup of BBQ seasoning, then wrap foil around the pork. (tabasco.com)
Lift arms out to side of shoulders in a «T» shape, arms are shoulder height. (christinebullock.com)
Instead, the biceps are supporting the weight in an isometric position, which is possibly pissing off your tendons at the front side of the shoulders instead. (bodybuilding.com)