with the lighter firing pin i have not had a single slam fire using WLP,s and the adjustable gas screw puts the boxer primed cases about 3 feet away in a nice pile. and the cost is very low for the benifits received. eastbank.
The benefit of the titanium firing pin is that the face of the pin is flatter than the original which is exactly what shortening the original one at the tip (blunting it) will accomplish.
The slam fire issue is just like the SKS rifles. Free floating firing pin.
When the bolt slams home on a loading stroke, the firing pin is free to slide in the bolt and contact the primer, ready to receive the hammer strike. With military primers, no issue as its part of the design criteria. Use "softer" commercial primed ammunition or reloads, that's when the problem crops up.
It's not the lightened firing pin that matters, but the profile of the tip that will come in contact with the primer. The Mle 1944 had a firing pin spring in the bolt that would eliminate any issues, but was deemed unnecessary in the 49/59 with the hard military specification primers.
As for extraction and ejection on the 7.5mm, I've never noted anything other than smooth operation, easily recovered, and in good, reloadable condition. This is a direct gas impingement rifle designed for a specific volume of gas for proper operation, so I never played around with hotter loads that could have derived benefit from an adjustable valve.