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The problem you describe has been posted here before. As stated above, it's likely to be a PCV system problem. I'd replace those hoses in the system, install the rebuilt heads and turbos and go from there. IMO there's no need to replace piston rings.
Side note - oil control ring problems won't show in a compression and leak down test.
Also - dirty injectors and those crappy looking plugs can cause the combustion to be inefficient as well, which would show up as more carbon deposits, etc. I'd spend money on spark plugs, ignition coils and injectors well before replacing piston rings.
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