I ran (in my ST-1... similar to your RC8E) about:
10,000 center
7,000 front
2-3,000 rear (2,000 was good for drifting on gravel but other than that it seemed WAY loose for me)

Just go from there as a starting point, also track conditions affect how your handling is.... and don't forget camber, caster.... those can make a huge difference also [X(]