Resetting the head space is not a simple task. It involves removal of the existing barrel retainer pin, pressing the barrel either in or out a tad more to get the correct headspace using headspace gauges, milling in a slightly larger retainer pin hole and pressing in a correspondingly larger retainer pin. Not a job for the novice, but a professional can do it for $100-$150.
I am not convinced you have a headspace problem yet. I agree with the others, try some good surplus ammo or try a few rounds of Wolf 7.62x54R
I've heard not so good things about the recently imported Czech silver tip, but I'm not sure if it's true or not.
According to the guys at Tennesee Guns, they say avoid the Albanian. Also they recommend rounds that are lacquer coated over that of copper washed.
I think you have an ammo problem and it's cheap to prove out. Don't give up hope yet. Sounds like you've just found the source of you firing pin problem.