On hammer Parkers, the firing pins are termed plungers. A pierced primer is potentially harmful to the gun because the combustion gases can blow back through the plunger hole in the standing breech and then into the stock head and crack it longitudinally. Although replacement plungers are available , I suggest you remove yours, measure them and publish the length here. Ask others to compare theirs to yours to determine if yours are too long or if something else is amiss.
If yours are too long, although hardened, they can be ground to proper length. I do not know how they could be too long unless these are incorrect replacements.
As to the length of pull issue, there are several makers of slip on pads, Galco, Conn Shotgun, where one can be sourced. With any of them, add extra pads to suit.
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