If your trigger is breaking at over 6lbs, you need to pull it, clean/lube it and reinstall.

It's a two stage trigger, so you will have take up in the first stage.  Now it your hitting the second stage wall, and there is a lot of creep until break, something is not right.  With the parts in hand, check to make sure that the disconnector is freely moving in the trigger, and the whole trigger rotates on the pin freely (could be burs that are causing some problems).  If needed, lube and either work the FCG parts by hand, or use a stone and remove the burs.

Once everything is working smoothly, then with a trigger break gauge, you can tweak the standard hammer spring that you have by bending the spring legs upwards at the coil points.  The more you bend the spring legs (less tension, and equal), the lighter the trigger break point will be.  Now the reason that you want a break gauge is you will find that you want to stop tweaking the legs once you hit the 4.6 lbs mark.  Granted that you can go lighter, but as some point, you are going to just run into problems with light primer strikes, or a FCG that starts to fault.