My response to you from the Glock picture thread.
You don't have to stick with the stock trigger, but do stick to Glock parts.
You can keep the stock trigger spring and simply run a -(3.5lb) connector reliably, but thats stupid light for a defensive pistol. Match that connector up with the NY1(8lb) trigger spring and the overall pull is very similar to stock but you roll much smoother through the second stage. The reset will be stronger, and you also gain extra reliability with the trigger spring as due to the plastic "V" it will continue to run even if the spring itself is broken.