One other bit of information I failed to mention...

I also tried the 9# hammer with the 8# return spring. It functioned great. Not one light strike and the trigger measured about 8.5-8.75 in DA and just over 2.75 in SA. The only problem was the sluggish feeling on the trigger return. I feared "short stroking" problems so I went back to the 10# return spring which added about a pound back to the DA trigger pull.