I held the firing pin group up side by side for a comparison with a j-lock unit that I removed from a Ti rifle and didn't notice any difference in angles or wear patterns, but didn't put a set of calipers on it. I should have tried the bolt out of the Ti in it just to see how it would respond.
I think my buddy will appreciate the slightly heavier pull on the rifle at this point, he was pretty shook up over the incident and the extra weight may instill a bit more confidence in the rifle for him. 5.5 lbs sounds like a lot, but actually feels pretty good with the Timney.
