[okie]

Thom mentioned ball position already but I wanted to add something if I may. Ball position is in relation to low point and low point is all about the center of the club head orbit i.e. the left shoulder. So, it is better to measure it in relation to low point rather than just moving it back or forward in your stance, although it does sound like it is too far back of low point. Trajectory is largely a product of the selected hinge action. A ball too far back, say with a full roll of horizontal hinge action will result in a low screamer. Perhaps the fat shots are a result of you trying to help the ball up? I typically use a no roll (that feels like a half roll - angled hinge) on chips and pitches. Hope that helps.