I'm late to this thread, but this is my experience with a New Vaquero:
I tried the Wolff spring kit pack.
- Lighter mainsprings greatly reduce the hammer pull weight but reduced primer ignition reliability. I returned the factory mainspring spring into the gun.
- The Wolff lighter return spring does lighten the hammer pull weight enough to notice and it does not seem to affect reliability of ignition.
As for lubricating revolvers, they don't need much and generous lubrication of non-contact surfaces will only cause contaminants to stick to the parts. My practice is to use less than a drop of oil on the bearing surface of rotating parts. To get less than a drop, I am using a needle oiler. Then, I will use a fine amount of grease on the sear surface(s).
Lubrication works by having a film of lubricant between moving parts. Grease creates a film that withstands higher pressure between the moving parts. The sear has some spring pressure on it and the pressure is somewhat high not because the spring is very strong but because the pressure is distributed over a very small sear surface area. Oil is sufficient for most other bearing surfaces. Consider whether some bearing surfaces really need an oil film. The base pin is a bearing surface the cylinder rotates on, but does it really need a lubricant film? It has almost no pressure on it when it is rotating and it rotates very slowly. I wouldn't lubricate it.