The Cupra TCA rear bushes are solid rubber, so stiffer, all the other Ibizas have voided TCA rear bushes which are softer so allow a lot of movement. The camber on the Cupra will probably be slightly "more" than the lesser Ibizas. This is just, as said, the price you pay for needing good front grip with cheap suspension and wide tyres. The camber can be altered, my wife's Polo has the Cupra bushes and has had no front wheel kerbing etc, and has had four wheel alignment done twice, but I reckon that it is still wearing the inside of the front tyres quite quickly - so they will need swopped front>rear to increase their life a bit.