On the camber issue, I found -2.3º to be perfect with the RS3's but they wore on the inside and outside. The stock lower control arm bushings give that much. I'm on my 4th set of lower control arm bushings the current ones being Kmac's. I've only run one event with the Kmac's at -2.5º but so far the wear pattern looks good and the tire temperatures were close.

Les