I've given up with VW.. Going to take advantage of the Costco offer on Monday to get the tyres swapped on the current wheels (and take the risk of a scratch), then ebay the Bridgestones and replace them with something decent when summer tyre time comes round again.
It means having 18" winter wheels rather than the 17" I was going to have but it gets rid of the Potenzas (I'm getting fed up of seeing the traction control light) and it stops me having to mess around with VW anymore.