You can get a set of sear springs from Trapper Gun INC.sometimes depending on what weight you want,these may work.I tried these in several MK11 but didn't get down as much as I wanted and had to do more than changing springs,so I would suggest taking it to a gun smith to start with.
If you decide to do what you think is needed and you are not a gunsmith be very carefull because I don't think ruger will sell trigger parts to someone who isn't a guns smith.