I would think that a "grown up"
spring would apply more force to resetting the trigger.
I've started doing a bit of revolver smithing myself, on my own 65-2 and a local sheriff's deputy's 36. I would think that trigger return block (don't know if that's the correct name, the device that holds the trigger return spring) would have been what was holding it.
In the future, I don't think it would be a good idea to do any coating on any internals.