+1
When I was shooting my glock in Limited, I thought I could change it and make it better. All I ended up doing "even with the help of some smiths" was just adding unreliability to the gun. Springs, guide rods, magazine fiddling and so on.
I got to the point that I just put it back to stock and then it ran 100%. The grip tape was the best mod I found for it IMO... I did shave the grip some to fit my hand better and I do love that, in hind sight though. I might not have even done that because it prevented me from shooting production with the gun. I would have liked to still have that option open. Hope that is of some help to you.
Hope that is some of what you might have been looking for.