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You must have PCV system hooked up otherwise you run the risk of blowing out gaskets and it will always leak oil.

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You don't have to have a PCV but it is a good idea for many reasons.

If you don't have a PCV you DO HAVE to HAVE adequate crankcase ventilation though IE: non restrictive breather(s)

All engines develop a certain amount of Blow by. The PCV and or breathers relieve this pressure that would otherwise continue to build up inside the crankcase and eventually begin blowing gaskets seals etc.
If an engine is developing excessive amounts of blowby it is normally due to poor ring seal or a head gasket. A leak down test will establish which of the two is the culprit.
based on your description either your existing breather is very restricted or you have excessive crankcase pressure.