You might try the drop the hammer slowly while holding the trigger back all the way and see how much firing pin is protruding from the breech face, if it's less than about .030", remove a little off the face of the hammer where it stops against the frame and see it it works then. I just checked two of my SS1 frames, one has .032", the other .033" pin exposure. How's the transfer bar look, real floppy or relatively stable compared to other frames? Madison won't send transfer bars, but Brownell's will if you choose to buy a new one and replace it or have your smith replace it.
Tim