I've had this problem for close to 20 years or so and I have no clue what I'm doing wrong. On about half of my short iron shots I take a divot that would put a beaver pelt to shame. I'm confident my grip is right, I hold my head still, I turn my left shoulder under my chi on the backswing and turn my right shoulder under for as long as I can on the downswing, and I take a half yard of sod at impact.
I just came from the range and tore the tee box up pretty good. On the way home I got to thinking that on my short irons, I really play the ball back in my stance. I don't get the ball placement to the middle of my stance until I get p to the 7 iron or so. Could playing the ball that far back contribute to my taking of these huge divots/grounding out of the club? Thanks.