After trouble shooting, Here is what I sent to Henning to see his thoughts...
I swapped the XL firing pin back into my Stock II with the factory firing pin spring. It no longer made the click from the fpbs jumping up. Then I installed the XL with the reduced power firing pin spring, and again it would click from the fpbs jumping up.
What it looks like is happening is that the factory spring has enough pressure to push the firing pin fully out the back, holding the hammer slightly off the slide. The reduced power firing pin spring does not and the hammer lays flat against the back of the slide holding the firing pin in slightly. In that position the fpbs must be held in the down position and when the trigger is moved slightly back, it then releases up.
RRR