All I did was lightly polish all contact surfaces and added the two adjustment screws (2 screw mod). I didn't have any grease, so I just lightly lubed the contact points with silicon oil.
Be careful when setting the over travel screw, I have read that it might interfere with the normal operation of the hammer/spring if set too short. I can't remember for sure, but I think I did back mine off a little bit after I first set it because of erratic fps caused by interference with the hammer/spring. So there is still a little more over travel than I would like.
My trigger is OK, not great or good, but definitely usable and I can get used to just about any trigger over time with a lot of practice. (smile)