When you lighten the spring by backing off on the cocking piece, it shortens the firing pin travel and reduces effort to cock. It also reduces the energy. The cocking ramp can only be reduced enough that when cocked, the sear can still catch the trigger on the hand off (bolt close). Take too much off and the trigger cant reset. The hand off can be smoothed by making the sear travel on the hand off minimal. In my opinion this would require a 4 axis on your mill. The profile of the detent area can be modified to make bolt closing smoother as well. I'm not sure how Fred does it. Shortening the BAS and using a center contact point like some of the bolt lift kits can accomplish some improvements on opening.
Operate the bolt slowly you will feel several things going on, Many you won't even notice until you start observing. All of it need work. You could let Fred do it and it will be right the first time.
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