I freehand stone the trigger sear surface. The way it comes from the factory it is quite rough, and has quite a bit of lift in its geometry. I remove very little, and just change the angle a tiny amount to make the sear engagement a bit more neutral. If you look at a supesport/lightning sear you can actually see that they have a more neutral radius, but in principle the trigger mechanism is the same.
The wire that comes with the later supersport/lightning anti-bear-trap mehcanism is perfect for bending new sear springs