While you have the engine apart check all the oil galleys and tubes. The picture above shows gasket sealant that was plugging the oil return from the Rear Main bearing and plate. That's about 1/2 of what I dug out of the hole.

You can check the oil lines by squirting solvent in them using those handy little nozzle straws. If you see leaks from where they are pressed in plug them up with epoxy.

These are the oil returns for the Rear Main bearing and seal. Inspect them for any obstructions.