Tight on 3 & 4 says it may not be totally headspace. Although if you can get them "snugged" up some will still be a good thing. Your original posts says firing pin protrusion .050 or less....i shoot for .040 or so and others go as low as .035. But a lot of factory stuff comes out at .060 or a hair more.
If you adjust the depth keep in mind each tab on the "locking" washer is about .008+.
I hope you get it figured out, keep us posted.