Using the factory trigger spring will reduce the trigger pull. The DCAEK (duty/carry) kit is different than the FSS kit. The FSS kit radically changes the timing, thus almost no pre travel. The Duty carry kit smoothes the trigger and lightens it some. If you want your trigger to have less pre travel, also install the Apex polymer trigger. It will reduce the pre travel by about 30%. For the darling husband and I, this was the perfect set up for our carry guns (9c's).