I dont think you can fight this type of an oil burning problem with a PCV.
The PCV can help with reducing crankcase pressure due to pressure getting past the rings. But only to a point. It does nothing for oil in the chamber.At your cylinder pressure and leakdown numbers, I doubt there could be any gain from installing one.
However, I run one, to be used as an idle-air bypass, whenever the carb is set up for it. On the engines I have tuned, the bigger the cam, the more idle-air bypass was needed.If you are not running one, and you have not drilled your t-blades, then I suppose that your secondaries are cracked to provide the bypass? If not it would be nearly impossible not to be in to the transfers too far.The only other solution is to crank a ton of idle timing into it. And at 190+ cylinder pressure, thats probably not the best idea.Unless you are not running pump-gas.
The point is this; if cylinders 7 and 8 are burning oil, is it possible that they are running too rich? Rich enough to be washing oil off the cylinder walls?
I guess it wouldnt hurt to have another gander in those intake ports.
As a side note, my SBM-Eddies liked to pool oil at the back two cylinders. I cut some channels back there to help drain that oil.
