I have a 1958 Olds Ambassador that plays very nicely, but I'd like the valves to feel looser/faster/smoother. I know oils and springs have a lot to do with it, but do you veterans and wizards have other solutions? The vavle is top sprung with the spring on the outside. I use Ultra Pure oil. If your solution is to change the springs, and get thinner ones, will you tell me how to measure and communicate the need for something thinner?