This is all assumption since I dont have my rifle yet to test with. I think you have the right idea about a longer length of travel while the bolt is moving back into the buffer tube. That should help decelerate the bolt and soften the felt recoil. however you will then have a longer length of travel for the bolt to go back to its forward position. This could increase muzzle dip/dot movement since the bolt will have more time to speed up. My plan is to find a happy medium between the two. I have read multiple times that shortening the bolt stroke with spacers will make the rifle feel like it is recoiling harder, but will not impart as much dot movement. That leads me to believe the bolt is slamming to the rear with more force (hard felt recoil), and then going back forward with not as much momentum so it doesn't impart dot movement. I will definitely be trying this out next weekend when I have my rifle in hand. Im thinking of using cork to help soften the blow of the bolt. I think it would be better than metal on metal. If it falls apart which I think it probably will, Ill try rubber or delrin.