I'd be willing to bet the core problem is Endgame Combat. It looks to see if a "titanium-plate" item exists, and if so just mistakenly assumes a bunch of other things exist, like cobalt and nitinol.
I can see that brevven has tried to hack his way around that. Maybe the addition of the PA mk3 mod throws a wrench in the works. Maybe he can find a way to work around this too, but in the meantime you can probably keep SE and one of the other two mods.