Believe it or not, what I do with any pistol I intend to carry is start stock, in the holster I intend to use, and shoot IDPA scenarios with it, many times. Then I see what I am having trouble with, and address those issues. Maybe I change the way I dress, maybe the holster, maybe something about the gun. I DO NOT start off by getting somebody to screw around with the action based on some preconceived ideas of what's "BEST."
Here's some things I have changed with carry guns:
1. Those nice sticky rubber grips had to go on a j frame carried iwb tucked. Too awkward to draw.
2. A KAHR was returned to the factory for an upgrade to the new slide catch after the old failed.
3. Sight paint
4. New sight insert.
5. 3-finger j frame grips to replace a boot grip
6. Grind down the grooved trigger on a model 60 3"

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Science plus Art