On my RC8TCE coverted to "E" i run 7,10,5 diff setup i do remmend using at least 10k in the center diff with electric espially with a high torque/power motor .
I never messed with the shock springs there still stock on my so i dont know.
As for ride height i just set my "rear arms level" and my front arms a little above level but that does depend on the track surface.
Camber i use 1- at times or 2- on the rear end and 1- on the front at most.
My shock postions are stock as for bushings ive only changed my caster bushings to 14 degree insend of 16 degree.
That should handle good for the track condictions you race on.