Keep trying Joey for sure, he will sort you out. But here are the things I would look at.
#1, assuming you are running the mechanical rotary pump. It has a weep hole at the mounting flange specifically to vent fuel when/if the shaft seal starts leaking vs. leaking fuel into the oil. On an aircraft they route that vent so the pilot can see it so he knows things ain’t right. I carry a kit that I can use in the field to plumb that back to the tank if it ever starts leaking. Crank her up and see if fuel is leaking.
#2, you have a leak somewhere else in the plumbing. I carry a spare injector line just in case, the longest one. But this would exhibit as a dead cylinder, so that doesn’t match.
#3, you mention having to lean out because it’s pig rich. This most likely leads to a bad O-ring in the fuel servo valve. Pull the servo apart and replace the orings. It is pretty simple to pull apart. I recommend Viton material for maximum life, will also work on ethanol, but hardware stor Buna N will work. It is a standard size and I have a bag of them left after ordering 25 from McMaster last time I did it. Can’t remember the part number right now and not at the shop. Get out your calipers.
#4, the polished face on the valve has gotten scored. In operation this is unlikely, the servo would need to be disassembled and either damaged or a piece of dirt got in to happen, so not high on my list.
#5 is the fuel pressure regulator, which is actually probably #1 to check. You should have about 22 psi from pump to servo. T in a gauge and see what you really have. Usually the diaphragm starts leaking, High pressure will run rich.
