Hi Lee,
I just noted the Rude bits post for the Camber mounts you're using on the 502X:
http://www.oople.com/forums/showthread.php?t=95536
One of the pictures is a close up shot looking at the back of the front shock tower. It appears that you are using a 'wedge' or 'spacer' between the shock tower and mount place on the gear box cover. This 'wedge' would serve to move the front tower forward, further does it contain an angle so it lays the shock tower back at the same rake angle as the front suspension arms?
If so it would seem you have solved an issue that has been raised elsewhere on these forums.
The reason I ask is that I'm comtemplating buying either a 502X or 511x. Here in Australia the 502X looks the most sane choice as the diffs are sealed and our tracks are mostly outdoor and dusty, however I have been hesitant as there has been much discussion around the problems of the front end geometry of the 502x compared to the 511x.
The Australain National titles are on here in Sydney in early April, would be cool to see you here. I don't know if a Tamiya has taken a major title in Australia ever?
Cheers