I was told by one of the master smiths above that it's all about bending the main spring. Bend the top to the right to lighten the pull, lessen the rebound spring so it just returns to where it should be by either using a lighter return spring or cutting a few coils off the original.
Find the happy medium between trigger return and consistent hammer strikes is what its all about! Bring the tools to the range, take off the grips, find the sweet spot.