Well... If everyone is hitting low & left, even from a rest, it may be time to call S&W Service and see what they say. They may simply offer to swap out the barrel & slide to rule out Slide/Barrel mismatch (rather than sending the entire pistol in for service).
Even though the Slide may be within Specs and the barrel may be within specs, the slide may be at one end of the tolerances and the barrel may be at the other end (resulting in a bad match-up). [shrug]
Even though the Slide may be within Specs and the barrel may be within specs, the slide may be at one end of the tolerances and the barrel may be at the other end (resulting in a bad match-up). [shrug]