I'd second Constantine's suggestion that you try the NY1&-C.
If you stick with Glock OEM parts it's still technically stock, and it brings the trigger from okay, to fantastic. Better than the PPQ fantastic.
Trigger off the finger is the magic cure. Making the gun more complicated or with inconsistent trigger pull between first and second makes little sense - if in fact the increased trigger pull hasn't cut down the ND rate.
But some folks say that having a heavier first pull leads to an ND when someone rests their finger on a gun that switched to SA and they assume a heavier pull is there.
So why bother with such.
Sticking with one trigger system helps. As for CCW and size that's why I went from SIG to HK. I love SIGs, but frankly the HKs are lighter and easier for me to conceal. I'm hoping to post a review soon of an FNP9-M. A compact model FN made that didn't see a lot of production but is basically the same height and length of a Glock 19 with the same capacity, except in DA/SA. Seems like it will prove a good option.
One gripe I have with Glock is those stock sights. The Glocks I've shot are capable of good accuracy, but those sights mess me up. I find I have to bury the front sight so it is slightly covered by the rear sight if I want to hit POA, otherwise I shoot high. Of course a sights switch is an easy thing, especially on Glocks.
Mine all sport Trijicon HD's.
Because I shoot them better. I haven't met a striker fired pistol yet that I can shoot as well as a DA/SA pistol. More so I like having a hammer fired gun and I like that hammer being exposed. Different strokes for different folks you know.
I know exactly what's wrong with that gun because I once fixed another shooter's pistol that had exactly the same problem. The problem is that owner didn't read the manual.I found this -