Yea grease works great for a little while and then goes back to the same. Within a couple of hundred rounds or dry fire, returns. Never had to do this on my Gen-3 Glocks. Maybe just make this part of my regular lube schedule? I use the Loctite copper anti seize grease that may be the same that Glock factory uses?
I changed out to new OEM trigger bar and connector which did help a little. My next move is maybe polish trigger bar, connector, plunger and firing pin.
Trigger is light on the Gen 5 just need to smooth it out. Gen 3s I have are crisp for Glock but feel a lot heavier than the Gen 5. I might try a OEM minus connector in those when I can find one in stock.