I was lead to belive that the CUPRA wishbones were slightly shorter than the other
Ibiza's because it is lower out of the factory.
Camber can be corrected by having the wishbone holes slotted where the outer ball joint bolts to the wishbone - then bringing the ball joint in towards the car effectively shortening the wishbone.
0.5º negative is the recommended setting for a road car to get good tyre life.
I get about 18,000 from a pair of front uniroyal rainsports without rotating wheels or tyres to try and even wear out.