I just had a revelation. People contend that bore axis is a primary factorization in the guns perceived recoil because of leverage. However I noticed that when the gun is fired the slide's rapid deacceleration point is when the true recoil begins. When the slide is in travel and the spring rate is doubling there isn't an acceleration in movement. Overall KE is mitigated through the reduced dV. Bore axis itself is a gross generalization of the weapons design, since the actual pinned bearing is the location of the slide stop. The location of the slide stop itself is where the force is transfered, and that in relation to the centerline of the counter force (the grip) is what gives the torque moment. Mounting the barrel lower has the potential to lower the frame stop, but is limited by ergonomic design.
From that it appears that an ultra light slide and a maximum travel distance in the spring is optimal to reduce recoil. The effective rate of the spring would be best left at a higher point to reduce peak KE moment, and rather dissipate it over a greater range of time. Then again a heavier slide would tend to expel greater energy down the barrel rather than into your hand. Hmm...
It also appears that the 1911 would be better suited with a deeper bushing interface with the guide rod. There was significant guide rod flexure relative to the chassis. Giving the guide rod stability would help reduce binding moment in the spring. As would reducing the actual coil pre-load in 1911's. Hence the reason HK utilizes a flat coil spring in it's guns; maximum travel before bind causes infinite rate.
One thing to consider is the fact that the gun needs to properly lock up, slide needs to travel fully to the rear to properly eject the spent round as well as to properly slam the new round forward.