Cant dissagree with your logic, as its most probably correct.
But its got about 2* toe out, 5-6* castor, and about 1.5* camber... So we'll have to put it down to camber. Its going in for a wheel alinement on tuesday, so I'll get the settings you posted above done, see how I go with that.
That said, my logic was if the car cant roll, its gotta go somewhere, so if the car cant roll over a bit to lean on the tyre, it goes somewhere else, being to the edge of the tyre. So maybe its somewhat to do with tyre pressure too. I havent had much sleep this week tho, so it probably doesnt make sense to anyone else.