Agreed, you cannot put lighter (aftermarket) versions of the striker spring or the striker safety block spring or the trigger return spring in and still stay in Production Division (not that there's anything wrong with Standard!).
One thing you can try, however, is the NY1 trigger spring in combination with the minus connector. It probably won't lighten the pull any, but many people like very positive reset afforded by this combo. Play around with it, see what you like. You've got to try the pieces in your particular pistol: I've seen much more variation in trigger pull weight than I would have expected in supposedly identical Glocks. After doing the 25 cent trigger job, simply dropping the minus connector in mine made it uncomfortably light, in my opinion (and my primary pistol is a 1911).
One thing you can try, however, is the NY1 trigger spring in combination with the minus connector. It probably won't lighten the pull any, but many people like very positive reset afforded by this combo. Play around with it, see what you like. You've got to try the pieces in your particular pistol: I've seen much more variation in trigger pull weight than I would have expected in supposedly identical Glocks. After doing the 25 cent trigger job, simply dropping the minus connector in mine made it uncomfortably light, in my opinion (and my primary pistol is a 1911).