Good, i'm Glad the video and other links help.
Here is another video on grip.
So if someone else is hitting the mark dead on, then it is not the sights.... unfortunately it is human error....
so do NOT adjust the sights....LOL
There are a few things you can do. With an EMPTY Magazine, And empty Chamber..."No ammo at all" in the gun, OR around the gun...Sorry, need to say that for safety sake..LOL...
First off, I hope you have found your correct grip, and maybe a stance after watching that video.
Anyway, pointing the weapon in a safe direction, pull the slide back and then release it, as to cock it.
Get your grip then Raise your ARMS up to your eye level, do NOT lower or tilt your head down to the pistol, just simply Raise your arms up level with your eyes....Make sense....
Then slowly squeeze the trigger. DO NOT release the trigger. Slowly ease the trigger out JUST until it "clicks" this is the trigger reset, so STOP there, do not release the trigger any farther than that when it resets. Now Slowly squeeze the trigger again. By doing this, you will only get one click of the firing pin, (the "click" sound) so on the second squeeze, there wont be a click... but it will help with trigger control.
Now while still maintaining this grip and the pistol still in a safe direction, pull the slide back again and resume your proper grip, raise your arms up to proper eye level, and squeeze the trigger. Again, slowly release the trigger just until it resets, and squeeze it again.
After you do this for a while, you will eventually get faster at resetting the trigger, and it will all come natural to you.
The main thing here is to Never take your finger off the trigger as some do to get a better grip or feel....
Do these few steps over and over again until you are so tired of doing this... then do it some more.... LOL... in other words, just keep practicing over and over....
Over time, this Will help you with trigger control.
Another thing is Proper stance.
Then breathing control.... but This is another lesson.
Then there is proper sight picture.
LOL... the list goes on and on.....
I hope these things do help you.
As always, Stay Safe.