hey Mith try my setup, I have done all the allowed endurances and all the amateur championships with my 1051hp r34 gtr vspec2.
try this:
spring rate: f: 4.0 r: 12.0
ride height: 86mm all
shock bound: 5 all
shock rebound: 7 all
camber: 0 all
toe: 0 all
stabilizer: f: 1 r: 2
brake balance: f: 24 r: 1
limited slip:
front = 60 all
rear = 5 all
gear ratio: up to you
downforce: 0.29 0.60
ASM: 1
TCS controller: 1
VCD controller: front distribution 10%
tips on cornering: you have to brake hard while cornering to make a slight powerslide then throttle gently when it's on the right angle