Finally got around to polishing the striker hook on my SW9VE. Used some 1500 grit paper and polished the hook where it engages the sear. Made a noticeable difference in both trigger smoothness and weight of the pull. Between this and the SigmaTrigger sear work and spring, it's now a much better pistol.

Update: Finally broke down and bought a trigger scale. Sigma measures out around 7.75 to 8 pounds now. Had been over 12 before the sear work. That's decreasing the pull by about one third. I can live with that. In contrast my two Glocks measure out around 6 - 6.5.