The really "trick" Glock trigger jobs move the location of the trigger pin (that goes into the trigger bar) in the trigger itself (among other mods). An expert on the Brian Enos forum posted the details a while back and I did it to my G35. I got the trigger as good as possible, but it still is a Glock trigger so it will never be good like a 1911 or other gun which has a sear and a trigger that can be tuned.
As for the striker spring: you can get a "Lightning Strike" reduced mass striker that greatly increases strike energy and that will let you cut the striker spring force down significantly (which does lighten trigger pull).
Last edited by Alizard; 04-08-2012 at 12:40..