I race on very different track in TX. I have been fighting for rear end side bite for a long time without the car dumping the rear in high speed sections. It's hard packed but the dirt contains a lot of sand so we still end up with fluff. Due to the sand we have to run wet or we get zero traction. The layout is interesting mix of high speed sweepers (including an oval banked "bowl" turn), mid sized jumps and tight 180's. After settling on step pins as the tire after trying just about everything out there.

Here is the setup.

RB5 with worlds kit rear end (UMW510), velvet shocks all around, Ti turnbuckles.

Front:

25 degree caster
35 wt, 3A, light yellow spring, middle tower, outer arm
shock bottom unscrewed 2 turns
camber link middle tower 0mm, outer hub
-1 degree camber
arms level
Jconcept groovy
no added weight

Rear:

30wt, 3B, purple spring, outer tower, middle arm
(middle arm conversion w/ new shorter tower & stock shafts)
(same as stock tower middle w/ long shafts)
shock bottom unscrewed 3 turns
camber link middle tower 0mm, outer hub 3mm
-1.5 degree camber
bones level/slightly down
less antisquat (flipped front hinge pin block)
Proline step pin
35g under tower/behind battery (running Lipo)

Misc:

21g weight to receiver side to balance heavy LRP TC Spec ESC
battery forward
tranny raised 1mm