If you're shooting Production, you'll want to be careful about doing anything more than swapping the connector. My G17 had a pretty decent feeling trigger (for a Glock) and changing to a 3.5lb connector brought the pull down to 5lb 5oz. I wouldn't want to go much lower for a Production gun since it's hard to get a consistent reading on a trigger pull gauge with the Glock trigger. If you get checked at a match, you don't want to be under. On my G35, putting in the Wolff 4lb striker spring with the 3.5lb connector brought the trigger pull down to 4lb 8oz without any polishing of parts. Not sure if a titanium striker would bring it down even more. Some after market trigger kits (Vanek and Sotelo) claim to get the trigger down to 2lb. Haven't tried those, but that's only an option if you're shooting Standard or Open anyway. Changing the striker spring is kind of a mixed bag anyway. I didn't like the feel it gave me with the G17 (too spongy), but it feels pretty OK in the G35. YMMV.
Ron