They all "consume" oil, VWs guidelines are high for these models.
PCV does not cause the loss of oil, it is where the oil vapors are traveling
through to be burned through the intake. This also speeds up carbon build up
on the intake valves, and intake runners. A catch can will help slow the build
up, but not prevent it. All forced air intakes have more blow-by than naturally
aspirated. Installing a catch can will help you gauge how much oil is blow-by.
If the PCV is wide open, you lose more oil vapor through there, but, it's still
blow-by gases that are there in the first place. Could also be that the separator
is clogged, allowing more oil through the PCV system.
It also depends on the OIL you are using. I had a '13 TDI, and my catch can would
fill up 2 times before each oil change, with Rotella T6. I switched to DELO400, and
maybe half full at the oil change. The DELO400 is even cheaper than the T6, and
I got less consumption.
Leave your PCV Valve alone, for now... 10:1, that's not the problem, and hardly
ever is. BLOW-BY is the main culprit.
My '15 TSI Sport was always a quart down at oil change. That's NORMAL.