Thanks for the tip. Yes, the sudden onset could be a tip that this could be the true source of the blow-by. I couldn't really correlate the blow-by to the overfilled crankcase, because it seemed that I did the oil change long before the blow-by issue appeared. I've got my fingers crossed that this is the problem. It likely would be a whole lot easier to rectify.

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1986 300SDL
1987 300SDL
1997 F-350 Powerstroke Turbo Diesel
1969 32' Luhrs Perkins HT3.54M Turbo Diesel
WVO & biodiesel when I can get it
(there is a de-facto ban on biodiesel in CA
- ask the Water Quality Resources Board why
underground storage isn't allowed for biodiesel -
heck, you can drink the stuff )