The only things that impact trigger pull weight are the sear spring (left two leaves) and the hammer sear engagement.
For hammer sear engagement, the hammer hooks have to be cut to a height of .020" (some go to .018), The hammer hooks have to be squared and polished. The Sear has to have the proper primary and secondary engagement angles, and those surfaces have to be polished.
But all of that is towards getting a clean crisp trigger with no creap, and you need a jig and a bunch of stones to do this work.
Since your hammer was already at 3 lbs, the only adjustment you should be making is to the sear spring as previously described.
One exception.... If you rack the slide and let it slam forward and the hammer falls into the half cock notch, you may need to have the hammer and sear re-cut, or even replaced. (Note, this is not a practice I recommend, but it should be done once or twice after a trigger job just to make sure the hammer doesn't fall. After that, don't do it again, because it can screw up a good trigger job)
Even if the hammer is falling, it can often be corrected by increasing the tension on the sear spring. Everytime I do a trigger job, I replace the stock sear spring with a Clark four leaf sear spring. The fourth leaf helps to prevent hammer fall on guns with light triggers.
Long story,,, short answer, bend the spring some more.
