I think I finally found something (haven't we all said that a million times)that seems to be helping with hitting fat shots.
When I go to the range, I set up normally, with the club in the middle of my stance for iron shots, and put the ball inside my left foot, like I was hitting a driver (I'm right handed). I then try to hit the ball and focus on what it feels like to hit the ground near my left foot, and I take that feeling and replace the ball back into the middle of my stance.

Anyway seems to be working so far, but I'm pretty sure I've said that before.....