First, most of the reduction in felt resistance is probably due to the fact that with the 0.010" reduced tension on the spring from your thicker washer you're not not compressing the firing pin spring as much. Less compression = less resistance. As you might imagine, this can also lead to ignition issues, so no - I wouldn't recommend trying an even thicker washer as you'll likely find you'll have insufficient energy to set off the primer.
The small clip between the two springs really has no direct effect (positive or negative) on the bolt lift effort.
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