The simplest and likely the best fix is to replace the mechanical trigger with a propped sear trigger as made by Timney, Bold, etc. Some brands are quite reasonably priced.. The trigger work needed to make a mjor improvement is fairly complex.. Sear engagement has to be limited to remove the creep. This can be done several ways including grinding away the excess or (better idea) installing an adjustment screw to gradually remove the slack and sear engagement until it is safe but clean. This is accompanied with cleaning the surfaces that rub and polishing the engagement surfaces to make is smooth. There are even methods to make the trigger tension adjustable. Howe's book on gunsmithing hace a lot of good info on sporterising these old rifles.. Removing the bolt stop 'button' and streamlining the rear receiver ring, altering the contour of the 'boxcar' tang, and even shortening the striker fall (and thus the lock time), while keeping the gun reliable and safe..