You didnt notice any improvement because you now added more spring pressure to it.

You need to measure from the top of the ball bearing to the bottom of the washer. Should be right around .110". That will be how much you need to relieve off the Bolt assembly screw(or BAS for short). The idea is to have less contact area without any increased spring pressure.

BTW, those bolts are VERY hard, so you may need to take it to a machinest or gunsmith to shorten it.