So I was able to take my Sp101 apart for the second time to smooth things out a bit. The first time I just used metal polish and oil. This time I used 1500 grit sandpaper to smooth the contact points of each part. I didn't change springs or use shims, but I am surprised how much smoother it made the action. However, I'm not sure if the made sandpaper difference or the fact that I removed the gunky powder residue from the cylinder pin. Although it is not much lighter of a pull now, it feels more pleasant than I had expected.