Hello, i dont want to hijack your thread but i am having similar issues, mines a 2.5 TDi, like you i have sorts of vibrations from the wheels at full lock in either direction or when i reverse.

It sounds and feel like the tyres are rubbing against the arches, i have managed to jack the car up to see if there is something stuck in there but i am no expert and cannot diagnose it?

Could it be CV or maybe tracking out of alignment?

Let me know how you get on with yours as mine is booked in on monday now for a checkup but i am worried the garage may not be able diagnose it properly.