The shield is my least favorite pistol. I carry it mostly because it's a lot more comfortable to carry than my full size 1911 especially when driving or sitting for any length of time. I do shoot it when I go shooting more or less just to practice and since I am starting to reload my goal is to load for everything I shoot.
Where I am we qualify for ccw carry at 7 yards. That's really all I want out of the shield but I would like to shoot it the best I can.
I got the Shield as I wanted a single stack 9mm option that was smaller and thinner than Glock 23.
And you can't compare an ultra compact pistol to full-size pistols as their purpose and application are different and some compromise is expected. If you compare the Shield to other ultra/subcompact pistols, you will find that its recoil and accuracy is way better than average. There are some ultra/subcompacts I have shot that I won't even consider as trigger, accuracy, felt recoil and shootability were too much of a compromise for me.
I teach/share defensive point shooting and many female shooters, even elderly shooters, have found Shield 9mm particularly attractive due to size that fits their smaller hands well and compared to other subcompacts, they demonstrate greater degree of proficiency and accuracy. We conduct point shooting training at 5-7 yards, and many do not have any issues placing all of their fast shots on the multiple copy paper targets, usually with 2"-4" groups (This is fast double taps). I do fast headshot demonstration with Shield at 7 yards and can consistently produce fast double taps and readily demonstrate magazine dumps to COM (intended practical application of the Shield).
Keep in mind, Shield is a close range pistol intended for defensive shooting, not long range target shooting and fills that role quite well.
In my recent group, elderly wife of one of the shooters shot the Shield better than other pistols we had and produced 2"-3" groups at 5 yards point shooting and consistently outshot all the other shooters shooting my Glock 22/23 with 40-9 conversion barrels.
I don't have more than 500 rounds through it yet so hopefully it will get a little better with age.
Dry fire the Shield while watching the front sight. If it jerks or moves when the striker is released, it will affect the group size on target and you should continue to break in the Shield until the front sight doesn't move when the striker is released before finalizing an accurate load.
For my Shield, I dry fired several hundred times before I started shooting it to smooth out the trigger.