I polish a Glock 34.3 trigger bar, polish the fp safety, and connector. You can even polish the plastic that the trigger slides on, but it'll do that itself in a few thousand rounds. I use a cloth dremel wheel and Turtle Wax Chrome polish.
Aftermarket strikers are polished nicely. And you can cheat here, lube the striker a little. But detail strip and clean it before CCW use.
How smooth the Glock trigger feels, improves with age, and has no effect on the performance of the pistol. Only the break does that. So only the connector and striker spring effect that.
Pick up a Lone Wolff striker spring kit. Medium should help a little. Avoid the light spring. It often needs stretched, and improper setting, might effect the Glocks safety.