For what it's worth...
In my opinion, cleaning the pistol and a new 'standard power' firing pin spring may fix the light primer strike problem.
Please note that it's very important to ensure that the firing pin channel is clean all the way to the breech wall. The firing pin 'floats' the last 1/8" or so of travel and must be 'free' to do so to maintain sufficient momentum to strike the primer properly.
Also, in my opinion, the noted wear really doesn't warrant replacing the extractor... unless you're having extraction related issues.
The triangle shaped mark machined into the breech face of your slide appears to be part of the milling operation that cut the extractor slot. The breech face of my slides have similar marks.
Hope this helps.