video is processing now, but there are some things I didn't say but wish I had so I'll use this space to address those.
Pulling shots low can be from trigger finger placement but is usually from trying to combat recoil with your trigger finger, but can also be part of a flinch.
Developing a solid grip is possibly the most important part of shooting a pistol. This comes from a practical pistol perspective. Out at 25 yards I'm sure there are nuances that start to make a difference for precision, but generally these will be applicable.
Prepping vs. straight to the rear. You're about to install a hammer that will make your gun fire with sub 2# of pressure, with the resistance of the trigger spring you won't notice "the wall". Develop a good trigger press that works in double action, your single action press is going to be similar. If you treat the trigger as a heavy double action and a light double action, should you ever try to compete, it will serve you well. Long shots, yes prep, but typical pistol ranges (15 yards and in) it generally isn't necessary.
A superb drill to diagnose what's happening when you pull the trigger is (at the range) charge the gun with a round, drop the mag and put it on the bench. Fire the shot, then follow up with a dry fire shot. Observe what your muzzle does. A flinch/anticipation will be a sharp fast movement generally toward the floor, sometimes it will be up and to the right in a right handed shooter. If your front sight dips slightly as you manipulate the trigger than it's going to be your approach to the trigger. Ultimately you want to isolate your trigger press at the second knuckle and disassociate the trigger manipulation from the sympathetic movement in the other fingers. 3 fingers pulling hard and 1 finger pulling just hard enough to break the shot takes some practice. If you overpull the trigger you're going to jerk the sights down, or if you're not using enough grip pressure your trigger press can make the other fingers sympathetically tense and you start "milking" the grip which throws shots to the support side. Marry the two and you get down and to the left (for a right handed shooter)
On grip, I forgot to mention an important part. When I build my grip I engage my chest a bit, and the way I do that is by pressing the outside (pinky edge of palms, like you are pressing your pinkies together) of my palms together (with moderate pressure). Both hands will feel like they're slightly rotating out away from each other at the top of your hands, but because you're using strong pressure in your fingers it just locks the gun in. You'll know you've got a good grip and you've got your wrists locked out when you pull the trigger and the sights lift slightly then settle in on the same point of aim. If your grip makes you "trap" the muzzle climb at it's highest point then you manually slowly return the muzzle to target, you're not doing it right. That means your wrists aren't preloaded with the proper tension or you've got too much tension in your back.
That said, you should not feel tension in your back and shoulders when you're shooting. If you are, that means that the recoil impulse is traveling through your rigid arms into your core. What you want to do is create a condition to let recoil happen and your hands/arms need to be the vise at the end of two dampeners. Relax the muscles not actively engaged in gripping the gun. This is critically important if you ever start shooting on the move.
For longer range shots I cannot use less grip pressure, because the frame may start to move during trigger manipulation, my 25 yard groups are shot with the same grip pressure as the hoser arrays 5-7 yards out.
As far as how it worked for me, squaring away my grip and eliminating play in the gun during trigger manipulation paid the greatest dividends and ensured acceptable shot placement, refining trigger manipulation will lead to precision in shot placement. Plus with these CZ wonder guns you can then have a "floating" sight picture and they become really fun. CZ's are great in slow fire, but when you get opportunities to start running at speed you'll get a whole new level of appreciation for the 75 design.
Aaaanddd we're done.
