The surface on bottom of receiver where the two stage humps rub needs to be polished smooth ,buffed and lightly greased with something like Tetra . I use 400 grit lapping compound on trigger pin inserted in in trigger with a drill to clean it up then wash it out with solvent. Same with sear pin and sear pin hole. Polish up sides of trigger , trigger opening in sear, sides of sear . Face of sear needs to be clean , buffed and lubed. Don't change engagement angles . Your cocking piece needs to be clean and buffed .
You can buff the surfaced somewhat with hard leather( saddle skirting , harness leather) glued to a wooden backer like a paint stick and use rouge on the leather strop , go easy ,slow and deliberately . Several strops can be made from 1 paint stick.
Clean all well and lube before reassembly .