What's the best way to improve my groups?
Here I have a photo taken with my cell camera after 36 rounds fired at 5 yards from my 9mm SIG P226 (2 18rd mags; I was out to blow off some steam and try out something different with my feet). While I can definitely tell that this stance is working (I seem to go into an athletic stance on reflex when I shoot, and rather than trying to change this, I did some research and found that there is a stance that uses this, and decided to try it), my shots are still all over the board. I have heard several different things to train myself, such as drawing on the target, or taping a playing card to the center of the target, but I haven't had much luck (except for the playing cards thing; I haven't had the chance to try that yet).
Any pointers from masters to a novice?