I like PCV systems when they're functioning correctly the motor stays a lot cleaner. Usually the valve covers have a baffle to prevent (minimize) the oil from being sucked into the PCV system. However, if the PCV is sucking oil, a oil separator maybe needed.

I'm a little suspicious of the head gasket at #1 & 3, I would do another compression test. I know it's running good right now, but if the head gasket is leaking it is just a matter of time before it mucks up this carb and your right back where you were.

But at the very least, pull these plugs and see if they're fowling again.

Though, I'd hate to see you ruin another carb for the lack of a compression test to find a bad head gasket. A leak down test would be in order too in my opinion. It would show the leakage between the cylinders that to the untrained eye may not show up well with a compression test.