Thank you for the explanation. I'm not going to worry about it if it's an aspect of the design that you have accounted for, and my protrusion sounds within normal range.
The protrusion from my P-07's breech face is hardly visible, and mainly detectable by feel, with a fingertip or a fingernail, when the firing pin is shoved completely in with a tool. I'm not sure how I would go about trying to measure it at the breech face with my caliper, but it feels well below the depth of dents I have seen in the primers of light strikes from other pistols in the past, and is probably in that <.01" range.
I also have a basic understanding of the passive inertia-based drop safety, having familiarized myself with it being the only drop safety present in some DAO pocket pistols which have no active firing block. This is relying on the FP spring to prevent the forward momentum of the FP from moving it forward, in the event of dropping it on the muzzle or similar.
I did take it to the range earlier, and had a 99% successful test after the latest modifications. I fired in order:
50 x Fiocchi FMJ 115 gr
50 x Sellier and Bellot FMJ 115 gr
15 x Federal HST 147 gr
15 x Hornady Critical Defense 115 gr
50 x American Eagle jacketed flat point 147 gr
Almost everything was flawless, but I did have one light strike on #46 out of 50 in the box of Fiocchi, that fired on the second strike. This is my first light strike in either of my P-07's and a few thousand rounds, at least 2K through this pistol. The primer was dented pretty good by the first strike, but not good enough apparently. I really expected the S&B to fail afterward, having given me light strikes in other pistols in the past, but it worked for 100%.
I think I'm going to put the 18 lb hammer spring back in it and go back to the range with three more boxes of that same lot of Fiocchi I have, to see if there are any additional failures.
Thanks again for the information on the firing pin.