The pcv valve only admits air flow at low/idling speeds, when air speed through it becomes a certain amount it pushes the valve against it's seat and effectively closes it, you sound like you obviously have more pressure than the std system can cope with.
There is no advantage to having a pcv valve, it dilutes the fuel with oily fumes, I would just plumb in a system like you describe, always as you say use a baffled tank to catch the oil fumes allowing them to settle and drip down, then place the return below oil level, , you will also need a atmo vent pipe going into this tank right to about 1" from the top, as far from the inlets as you can.
tabetha