Low and Left is typically an Anticipation Push Off combined with inadequate trigger control. In your case I would suspect that you've spent too much time shooting your P-07 and Kahr and have lost your "familarity" with where the trigger on your SD actually breaks.
One obvious solution is to spend more time with your SD. Another less obvious solution is to pick up another handgun, specifically a Double Action Revolver such as a S&W model 686 or a used model 67. BTW, I favor the model 67 because the old tapered barrel versions have the finest balance in the hand of any handgun ever made. They also typically have a very smooth DA trigger.
Now as to why a Revolver can solve your problem. It's very simple, master using a Double Action trigger properly and you'll be able to shoot well with ANY type of trigger. BTW, the PROPER technique is to pull the trigger COMPLETELY through the break in one smooth complete motion. While it is easier to get better accuracy with a DA trigger by staging it (stopping just before the break) if you fall into this bad habit you wont ever master the technique of pulling the trigger on a handgun in one complete and smooth motion. So, even though it may seem impossible when you start in 2 or 3 months of steady practice you'll get to the point where you can shoot 4 inch groups at 25 feet or so with a less than 1/2 second split time. At this point you'll get more than a bit hooked on shooting revolvers and you'll just keep improving to the point where you can shoot any handgun you pick up well.
