globemountain,
I agree with you on the 10 pound spring. I also had the same problem with the lighter springs. They would fire probably 95% of the time, but there was always that inconsistency.
I changed the trigger spring, but I really don't remember how I did it! I am certainly not a gunsmith and I don't have any special tools, yet I got the job done. I think just look at it closely and make your moves very deliberately! I may have clamped the trigger assembly in a rubber-faced vice to allow for a steady, sure hold as I was doing the work. If I remember correctly, the small springs can go flying so be careful. Maybe place a cloth over your hands so if the spring/holders go flying, they will hit the cloth and not go far...Very, very small... Must not have been too difficult as I am mostly all thumbs unless 1" drive sockets and tools of that size are being used!!! Good-luck...BCB