I bypassed the RS by plugging the rear bottom fitting going to the RS. I bypassed the PCV by connecting the inlet(from front hyd pump) to the outlet(bottom front fitting) going to FEL directly hose to hose(PCV was left out of the sytem but still attached to the transmission. Hope I'm explaining it correctly. If my RS is not functional, I can use a 12V actuator to operate my snow blower chute.
So forward lower fitting goes to the loader.
Lower rear fitting to rockshaft, and nothing else?
So I ASSUME, no rear SCVs?
When you had the PCV off, did it have one or two passages on the mounting side? I suspect, at least the bleed off.
Did the transmission case have passages to match?
Maybe Industrial version has the internal passage to the rockshaft that is not used (since you say rear from PCV goes to rockshaft, I ASSUME an external line), and the internal passage is somehow leaking to sump?
Have you tried bypassing the PCV and connecting direct to rockshaft, leaving loader disconnected? If this brought back problems, rockshaft or it's valve is the problem. If no problems, put in a TEE, main pump to loader and rockshaft, and plug all connections on the PCV. Leave the PCV on the tractor.