Dom, take the car for a good hard drive and get it nice and hot. Let it sit at idle for about 1-2 mins then rev it hard in neutral, see if you get a cloud from the exhaust, if so it could point to turbo oil seals.
I still cant 100% rule out a breather issue either. I have had cars in that use a lot less oil than yours but still have oil consumption problems and they smoke a fair amount, on the test drive in yours today thete wasnt much smoke at all.