I finally figured out part of what I was doing wrong. It wasn't my aim, and it wasn't necessarily my trigger squeeze. It was my stinkin' grip! I used to crush the grip with my strong hand and didn't grip very hard with my support hand. Today I relaxed my trigger hand a bit and gripped harder with my support hand. I also started using more isometric pressure (pulling in with my support arm while pushing out slightly with my stong arm.) I'm very happy with the results. As usual, I'm a lefty shooting my S&W M&P 9.
Here's a target with 20 shots as I was figuring things out:
And here's the best 10 shot grouping I've every fired after I was in the zone:
Tells me your trigger hand was doing something besides squeezing the trigger when you fired, maybe jerking or pulling the grip in some way.. Which was alleviated by less grip power in that hand.
Exactly. I finally spotted it while dry-firing at home. While the trigger was breaking, I noticed a small but noticable jerk down and to the right, which is where most of my shots were hitting. So I just experimented with different grips and hand/thumb positions until that jerk went away. So then I started crawling out of my skin for the rest of the week until the weekend when I could finally go to the range and try it out for real.
Sorry... I forgot to mention the shooting distance. I was just shy of 7 yards for the two groups in the pictures.
I'm willing to bet that I'm jerking the pistol all over the place as well after seeing what the groups looked like from someone that knows how to shoot when I was testing that 92FS (3" at 10yds compared to my 6" groups.. embarassing!)