I do see what you are looking at. Changing the angle of the sear on the trigger does what you want, it does not take much to remove a lb of force from it.
The bending of the trigger spring does reduce the pressure, especially the ones with a trigger block safety in it, that spring is usually a bit stronger. Figuring if you reduce the amount needed to pull the trigger by 1/2 by bending the spring, by the time it translates to the sear that will multiply by the less amount of force to disengage above the fulcrum point of the triggers pin. Trying this first may surprise you in the end, worse case scenario you have to remove the spring to bend it back.
Now if you have a dremel tool with a cutoff wheel you could put a new spring retainer notch in the trigger plate and move your retainer plate back a little reducing the preload and reducing the trigger pull a little. Most often the reduced springs are used in CASS and SASS competions to make the cycling of the lever much easier to do, so you can keep on target easier.
If you are uncomfortable in stoning the triggers sear angle take it to a smith, they usually only charge around $30 reduce it to around 3lbs.