Well I put it all back together yesterday and no mystery parts were left on the bench! For this one I just did a basic polish job, installed a CGW lighter trigger and fp spring, a 15# hammer spring and, of course, the requisite floating trigger pin and firing pin roll pin. This brought the SA down from 5 lbs 8 oz to 3 lb.s 10 oz, and I know it will get better as I break it in. The real surprise was the DA, which went from 10 lb 2 oz to 7 lb 3 oz. That's the greatest decrease I've achieved on any CZ I've done.