Maybe, just maybe its not him and, heaven forbid, it may be a problem with his shield....yes I said it.
Everyone automatically pointed to the shooter as the problem, and sometimes it is, but the man said he can shoot similar weapons correctly. So I would say call s&w.

I say this cause I got the same, "your not shooting it correctly" when I asked about why my sw9ve was shooting low. I knew it wasn't me, cause I shot it from a sandbag and got the exact results but people still told me it was me. I got new meprolight night sights, hoping maybe it would help, but mainly for the night sights.
The gun still shot low so I filed down the front sight and the gun now hits POA, off hand and from a rest.
Just sayin...