Actually, you can just buy Stu's FP. The one I got was a CGW and it measured .05" less than CZC, in regards to the channel rides the firing pin retaining pin. So, you want to increase the length of that channel to either .25" or buy Stu's and drop in. My CGW measured at .199" and as soon as I relieved about .025 it immediately remedied the light strikes.
I'm curious where you're relieving, on the Firing Pin, chamfering the FP channel on the slide behind the breech face so it goes out further? Can you give me a little more info as I'm not following.
EDIT: went back and re-read older posts, so you had to lengthen the channel for the cross pin on the firing pin. Got it. Which direction? Front or Back? I'm assuming back.
trick used when ext firing pin didn't exist. good times now, lots of parts being made.