Search youtube for a video on how to detail strip the gun. Do that, clean the innards up a bit, and a light mist of CLP. If it's dirty, it'll help. If it's clean, it'll lube it up. Either way, it'll help slick up the action a bit more.
I have this exact gun and after doing that, the trigger is durn near as smooth as the 686 I shot a few months back.
Q