For a punch shot, I have been told the following...

Ball a little back in stance, which delofts the club, so either choke down, abbreviate both backswing and the follow through or a little less club.

Unsure if opening stance was part of the advice I rec'd, is fading going to be a good thing, if anything I would have thought maybe closing the stance a little to give a slight in to out and hopefully a little draw to it would be preferable...