IIRC, there are actually two springs that affect trigger pull. One is the accutrigger spring that you can screw in/out. Or, on a non-accutrigger, the slightly bent spring, for which someone here offers free piano spring to lower the pull.

The second is the sear spring (this is the L-shaped spring with a few turns) that is on the side of the receiver beside the sear. SSS sells a lightweight version of this.

Personally, I simply turn the accutrigger spring all the way in, then use the lightweight sear spring.