You can replace the stock wire spring with one made from a buzz bait lure. The thinner wire will allow you to safely set your trigger in the 2.5 - 3# range. I’m offering this because of my experience with trying to lower the trigger weight with the factory spring. After adjusting the spring the trigger worked fine for a while and out of the blue it “slam fired”. Luckily it was on an empty chamber.
I replaced the factory wire spring with one made from the lure and polished the trigger and the sear (very lightly). I have not had a problem with it since and as I stated before it is set at approx 2.5#.