Hi,
I run this car in RTR (pullstart class) in Oz and I run:
Shocks: 40wt oil in shocks all round
Diffs: 0K rear diff/100K front (acts similar to a spool)
Springs: Hobao/Ofna yellow front/Mugen purple rear
Tires Jaco (Nitro shoes) 38 front/Jaco (Nitro shoes) 40 rears (I true the front tires 2mm smaller than the rears when new as the rears wear much quicker)
Most of the time setup is trial and error and by feel.