Normal kit diff
Less castor = more into a corner but less through and out (getting the nose in is the problem on slippy stuff ... exit rotation can be done with the throttle as the rear will come around)
More castor = less/smoother into a corner but more mid and exit grip (better for high grip stuff as it stops the car hooking / snatching into the corner but gives you the oppertunity to use the available grip on the way out)
I'd not run the ARBs as you want the car to roll to generate the grip. Trust me, the FS is really well balanced front to rear and on your sort of surface you don't want to bias either end of the car.
The soft oil / piston combination is also to encourage the car to roll to generate the overall grip but also will make the car feel less direct/pointy around centre so will be easier to drive on the slippy stuff
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