I've seen your mod on YT. Pretty slick I must say. One thing concerns me about it is that it looks like all your crankcase vapors are directed only to the #4 intake. Wouldn't that accelerate carbon formation on those intake valves as opposed to tapping into the intake close to the throttle body?
Where I'm at right now is at 142,000 miles and my OEM PCV system is still working properly. At the first sign that it's not it's going to be time to pull the intake to clean the orifice out, drill it out or do some other mod. Meanwhile I'm being as conscientious as I know how to keep my engine clean inside to prevent that PVC orifice from clogging. Using top tier gasoline with an occasional supplement and oil with known good cleaning properties. I do not have a blow-by issue yet so I have that going for me. My engine got the rebuild with new pistons and rings etc. so I may never see a problem but I've seen so many YT videos of these engines I'm paranoid.
I might do the Seafoam injection into the intake at my next oil change. I don't know if that will reach the PCV orifice though.