My oil burning pig. Pics too!

Not running a PCV is simply not a good idea on an engine you drive vs race. Get a PCV.
But - it could also be an issue of a lot of oil going to the top end and the positive seals not being good enough to seal it. What is the stem to guide clearance? If you don't know - you DON'T KNOW. You need to know when you're chasing a problem. It's either running down the guides (did the CNC porters bill you for new seals?) or it' coming from the intake. There's no other source for non-pressurized oil in the heads.