To Adam: The theory behind low carb diets is that, because the body burns carbs before it burns fat, if there are few carbs available to burn the body will burn fat for energy instead. This is of course in direct contrast to calorie...
I've got a 3 iron/hybrid that I use on narrow and short holes, especially if there is OB to the right and/or I have lost my faith in my driver & 3w.
If you practice it enough and can rely on it more than your bigger...
Have you considered moving the ball forward in your stance to hit it shorter, and back in the stance to hit it farther? Or do you feel this adds unnecessary variability to your game?