Hey, slow down... don't trade that 19 it's a great gun
I analyzed this situation for me, and found that because my middle finger was jammed up into the trigger guard, it caused the rest of my fingers to be offline a bit on the grip, making everything just a little 'off'
I shot the gun well enough, but it just wasn't quite right.
I ran across a thread on Glocktalk, which is apparently down right now, so I can't access it, where a guy sanded out the part where your middle finger goes, making more room for it, and subsequently all your other fingers as well.
Basically, you take a wooden dowel, about the size of your middle finger, and some sand paper of varying degrees, and hollow out the area where the front strap meets the trigger guard, making more room for your middle finger. Starting w/ a coarse paper, and working down to a very fine paper, to make it production smooth.
IMO, try to sand out the top part into the trigger guard and the top inside of the front strap, and not onto the checkered part of the front strap, to maintain optimum grip.
Then if your hands are large, you can add a hogue slip on grip, w/ finger grooves on it, when you do, the design of it, if placed properly, drop the actual finger groove separation down a fraction, making even more room for each finger, while still keeping the same size grip.
IMO, if you hack off the finger grooves, and you've already got large hands, this may not be very comfortable, while you would remove the obstacle of the high part of the groove, you may reduce the size of the grip, which may not be desirable. I think you'll find this other method just makes it fit better, while not reducing size, and if you add the hogue, then it puts more in your hand.
I wish I could link you to that guy's thread coz it was a lot better and more detailed, w/ better images, but here are my camera phone pics for an illustration:
Notice the area in the corner of the trigger guard meeting the front strap, and compare to photos below, it's a little thinner after the sanding, but still enough material there to do the job...
Notice the gap on the dowel where it meets the gun in the corner, compared to first photo, there's less gap now, meaning more room for your finger, see what I mean?
Then you can see how smooth it looks underneath, once you finish it off w/ the super fine paper, looks factory
Finished product above w/out the hogue grip
Now above is w/ the hogue
And my happier fingers...
The nice thing about this is you can take it slow, no power tools involved, take a little of at a time, and go back for more later if you want...
I carry this gun daily. It was my first handgun bought around Feb of this year. I shoot IDPA w/ it, mostly practices, but a couple matches. I shot 7th in accuracy out of 28 people, including LEOs, and a guy who shot 10th in his division and 33rd overall at the national IDPA match in PA this past weekend, so basically, this gun shoots well if I do my part, and for people w/ my level of experience, we're doing pretty good so far, so the mods didn't hurt anything. Hope this helps you in some way...
Regards,
Karz