I just picked up an 02' overland in February with 168,000 miles and am working through the same issues you are (VC gaskets leaking, replacing PCV and vent hoses and valves). From my research it seems valve seals are what causes the issue so unless you feel like pulling the heads to correct this you're pretty much stuck. Im burning about 1.5 qts per 1,000 miles and im currently running PP 10W-30 as a cleaning oil for the first 10,000 miles. Afterwards the plan is to switch over to PPHM and see if consumption improves. I notice smoke every once in a while during start up and after idling for a few minutes and giving it throttle. When I popped the valve covers off I found lots of dark varnish and some sludge but the H.O. runs strong and plugs were clean although very worn. Coming from a 4.0 that never used a drop of oil it seems like this engine likes eating expensive oil.
I suggest trying a high mileage oil first to see if consumption improves, otherwise its time to pull the heads to replace the seals.
What oil are you currently using?
Thorne - 02 WJ Overland
Bear - 99 WJ Laredo
Apollo - 08 Mazdaspeed3
Valentine - 99 XJ Limited