I now use a Kel-Tec .380 most often as my concealed carry. My son who is now armed security and formerly Marine Presidential Security taught me point of aim shooting and it does work. At 15 feet I can put 20 rounds in the rings and ¾ in the black. If I aim I have the same result at 21 feet. For me the key was applying 80% of the pressure with the off hand and 20% with the trigger hand. Since you remove the pistol from the belt or a pocket with the trigger hand it takes some practice to instinctively change the pressure.
Definitely agree with comments about posture. I always start with my 22LR before I dry fire and fire other pistols. He made the point to me to get your posture correct. Acquire and stay on target using your large muscles. He was taught the isosceles stance.
By the way ChildOfThe60’s, I am so there. We have a reunion each year of the guys I went through Navy Officer Candidate School with in 1969. There are always related several versions of what happened our first night.
The Kahr MK40 I purchased (used) is a tad smaller than the PM9 and has a stainless frame. Shoots very accurately for such a short barrel. A high quality weapon made in the USA. I love it; protects me & mine everywhere we go.
The best production mini handgun imo was the Star PD in .45acp. It was light handy, shot well and held up well enogh for it’s purpose. It also had excellent sights.
The frame was aluminum but the slide was steel. No real tricks just plain 1911 type function without the grip safety.
If you want to go really tiny, the Baby Browning and Berretta Minx are both better than those tiny single action .22 revolvers.
I had a PM40 that was the biggest piece of junk I ever owned. I bought it new and the slide would never return to battery. Customer service told me to continue shooting it for 200 rounds. At the end of that time it still wasn’t working and they sent me some new springs. Fifty rounds later it was still malfunctioning so I sent it back and they charged me $125 to fix it. It still didn’t work. They slide quit going back all the way, so I sent it back again. This time they completely rebuilt it. The barrel had peened, the magazines were faulty, and it needed to be remachined. They replaced the barrel, remachined the frame and slide, replaced the springs and magazines. When I got it back I took it back to the dealer and swapped it for a Springfield XDM.