Car was smoking at WOT and only at WOT, but ran fine. New turbo with proper restrictor, good compression, etc.

While poking around, I noticed a kink had formed in the line that connects the exhaust side of the oil catch can back to the pre-turbo intake tube. I tried unplugging the line so the catch can just dumped to the atmosphere and the smoking stopped.

I have the ECU mailed off being worked on right now so I haven't had a chance to drive the car again, but would a kink (which would essentially block off flow) cause the car to smoke? I guess would the blow-by not be able to travel back through the catch can due to the restriction and be forced back into the block?